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CVE-2026-53518 (GCVE-0-2026-53518)

Vulnerability from nvd – Published: 2026-07-15 17:17 – Updated: 2026-07-15 18:07

Title

Better Auth OAuth Provider: Race Condition in Authorization Code Exchange Enables Multi-Use Code Redemption

Summary

Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint for the authorization_code grant redeems a single-use authorization code through a non-atomic find-then-delete sequence, allowing two concurrent requests to pass the read step and mint independent access tokens, refresh tokens, and ID tokens; legacy /oauth2/token and /mcp/token paths in oidc-provider and mcp plugins share the same primitive. This issue is fixed in version 1.6.11.

Severity

7.6 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 18:07 UTC

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
better-auth	better-auth	Affected: >= 1.6.0, < 1.6.11

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-53518",
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                    "Technical Impact": "total"
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                "timestamp": "2026-07-15T18:07:40.302581Z",
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            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
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            "baseScore": 7.6,
            "baseSeverity": "HIGH",
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        "discovery": "UNKNOWN"
      },
      "title": "Better Auth OAuth Provider: Race Condition in Authorization Code Exchange Enables Multi-Use Code Redemption"
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  },
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}

CVE-2026-53517 (GCVE-0-2026-53517)

Vulnerability from nvd – Published: 2026-07-15 17:33 – Updated: 2026-07-15 19:21

Title

Better Auth OAuth Provider: Refresh Token Rotation Race Condition Allows Concurrent Replay and Token Family Forking

Summary

Better Auth is an authentication and authorization library for TypeScript. From 1.4.8-beta.7 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint on the refresh_token grant performs a non-atomic read, validate, revoke, and mint sequence on the oauthRefreshToken row, allowing concurrent requests with the same parent refresh token to pass the revoked check and create forked refresh-token families; the vulnerable range also includes embedded better-auth plugin versions before 1.6.0. This issue is fixed in version 1.6.11.

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 19:20 UTC

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version
better-auth	better-auth	Affected: >= 1.4.8-beta.7, < 1.6.0
@better-auth	oauth-provider	Affected: >= 1.6.0, < 1.6.11

Show details on NVD website

JSON

To clipboard

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                "role": "CISA Coordinator",
                "timestamp": "2026-07-15T19:20:42.640935Z",
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        }
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        "dateUpdated": "2026-07-15T17:33:38.943Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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      },
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          "name": "https://github.com/better-auth/better-auth/security/advisories/GHSA-392p-2q2v-4372",
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          "url": "https://github.com/better-auth/better-auth/security/advisories/GHSA-392p-2q2v-4372"
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      "title": "Better Auth OAuth Provider: Refresh Token Rotation Race Condition Allows Concurrent Replay and Token Family Forking"
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CVE-2026-53516 (GCVE-0-2026-53516)

Vulnerability from nvd – Published: 2026-07-15 17:13 – Updated: 2026-07-15 17:52

Title

Better Auth: Account takeover via OAuth auto-link to unverified pre-registered email

Summary

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, Better Auth's OAuth callback auto-link gate in handleOAuthUserInfo accepts implicit account linking when the OAuth provider asserts email_verified: true without requiring the local user row's emailVerified field to also be true, allowing an attacker who pre-registers a victim email through /sign-up/email to bind the victim's OAuth identity to the attacker's account. The same primitive affects one-tap, and emailAndPassword.requireEmailVerification: true does not mitigate the link-time verification change. This issue is fixed in version 1.6.11.

Severity

8.3 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 17:51 UTC

CWE

CWE-287 - Improper Authentication
CWE-345 - Insufficient Verification of Data Authenticity

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/pull/9578	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
better-auth	better-auth	Affected: < 1.6.11

Show details on NVD website

JSON

To clipboard

{
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CVE-2026-53515 (GCVE-0-2026-53515)

Vulnerability from nvd – Published: 2026-07-15 17:27 – Updated: 2026-07-15 19:30

Title

Better Auth: Privilege escalation via SSO provider registration: missing admin role check in @better-auth/sso

Summary

Better Auth is an authentication and authorization library for TypeScript. From 1.2.10 until 1.6.11, the @better-auth/sso plugin's POST /sso/register endpoint lets any organization member attach a new SSO provider to that organization because registerSSOProvider checks only for a membership row and does not require an owner or admin role, allowing attacker-controlled OIDC or SAML providers to drive /sso/callback/{providerId} organization provisioning. This issue is fixed in version 1.6.11.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 19:29 UTC

CWE

CWE-269 - Improper Privilege Management
CWE-285 - Improper Authorization
CWE-863 - Incorrect Authorization

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/pull/9220	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version
better-auth	better-auth	Affected: >= 1.2.10, < 1.6.11
@better-auth	sso	Affected: >= 1.2.10, < 1.6.11

Show details on NVD website

JSON

To clipboard

{
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    "adp": [
      {
        "metrics": [
          {
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                "id": "CVE-2026-53515",
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-15T19:29:56.598355Z",
                "version": "2.0.3"
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          "vendor": "@better-auth",
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        }
      ],
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          }
        }
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              "cweId": "CWE-269",
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          ]
        },
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          "descriptions": [
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CVE-2026-53514 (GCVE-0-2026-53514)

Vulnerability from nvd – Published: 2026-07-15 17:30 – Updated: 2026-07-18 01:13

Title

Better Auth: Unauthorized invitation acceptance via unverified email match in organization plugin

Summary

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, and in 1.6.14 and later when invitation IDs can be obtained outside the invited mailbox and requireEmailVerificationOnInvitation: true is not enabled, the organization plugin's acceptInvitation, rejectInvitation, getInvitation, and listUserInvitations recipient endpoints use session.user.email and an invitation ID without sufficient verified-email ownership proof, allowing a user with an unverified session for the invited email address to accept an organization invitation after obtaining the invitation ID. This issue is fixed for the original default behavior in version 1.6.11, while 1.6.14 restored compatibility for built-in opaque invitation IDs and leaves affected configurations requiring secure options.

Severity

7.7 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-18 01:12 UTC

CWE

CWE-287 - Improper Authentication
CWE-345 - Insufficient Verification of Data Authenticity
CWE-441 - Unintended Proxy or Intermediary ('Confused Deputy')
CWE-862 - Missing Authorization

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/pull/9577	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
better-auth	better-auth	Affected: < 1.6.11

Show details on NVD website

JSON

To clipboard

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CVE-2026-53513 (GCVE-0-2026-53513)

Vulnerability from nvd – Published: 2026-07-15 17:15 – Updated: 2026-07-15 19:29

Title

Better Auth: Server-side request forgery via unvalidated OIDC endpoints on @better-auth/sso provider registration

Summary

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tokenEndpoint, and jwksEndpoint URLs when skipDiscovery: true is set, store them on the ssoProvider row without origin validation, and fetch them during OIDC callback, allowing non-blind server-side request forgery and possible account linking when trustEmailVerified: true is configured. This issue is fixed in version 1.6.11.

Severity

9.6 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 19:28 UTC

CWE

CWE-20 - Improper Input Validation
CWE-345 - Insufficient Verification of Data Authenticity
CWE-441 - Unintended Proxy or Intermediary ('Confused Deputy')
CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/pull/9574	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version
better-auth	better-auth	Affected: >= 0.1.0, < 1.6.11
@better-auth	sso	Affected: >= 0.1.0, < 1.6.11

Show details on NVD website

JSON

To clipboard

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CVE-2026-53512 (GCVE-0-2026-53512)

Vulnerability from nvd – Published: 2026-07-15 17:18 – Updated: 2026-07-18 01:08

Title

Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider and mcp plugins

Summary

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the legacy oidcProvider and mcp plugins expose OAuth token endpoints whose refresh_token grant authenticates only possession of the bound refreshToken row and matching client_id, without verifying the confidential client's client_secret, allowing an attacker with a valid refresh_token to mint access tokens and rotated refresh tokens through /api/auth/oauth2/token or /api/auth/mcp/token. The @better-auth/oauth-provider package is not affected. This issue is fixed in version 1.6.11.

Severity

9.1 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-18 01:07 UTC

CWE

CWE-287 - Improper Authentication
CWE-306 - Missing Authentication for Critical Function
CWE-345 - Insufficient Verification of Data Authenticity
CWE-863 - Incorrect Authorization

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/pull/9576	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
better-auth	better-auth	Affected: < 1.6.11

Show details on NVD website

JSON

To clipboard

{
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          "cvssV4_0": {
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            "attackRequirements": "PRESENT",
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            "subAvailabilityImpact": "NONE",
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              "description": "CWE-306: Missing Authentication for Critical Function",
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CVE-2026-45337 (GCVE-0-2026-45337)

Vulnerability from nvd – Published: 2026-07-15 17:31 – Updated: 2026-07-15 18:02

Title

Better Auth: Device authorization approve and deny accept any authenticated session while the user code is pending

Summary

Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the deviceAuthorization plugin treats any authenticated session as the owner of any pending device code because GET /device does not claim the row and POST /device/approve and POST /device/deny short-circuit when userId is unset, allowing an authenticated attacker who learns a valid user_code to bind the polling device to the attacker's account or deny the legitimate flow. This issue is fixed in version 1.6.11.

Severity

7.6 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 18:02 UTC

CWE

CWE-285 - Improper Authorization
CWE-345 - Insufficient Verification of Data Authenticity

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/pull/9573	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
better-auth	better-auth	Affected: >= 1.6.0, < 1.6.11

Show details on NVD website

JSON

To clipboard

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CVE-2025-27143 (GCVE-0-2025-27143)

Vulnerability from nvd – Published: 2025-02-24 22:16 – Updated: 2025-02-25 14:29

Title

Beter Auth has an Open Redirect via Scheme-Less Callback Parameter

Summary

Better Auth is an authentication and authorization library for TypeScript. Prior to version 1.1.21, the application is vulnerable to an open redirect due to improper validation of the callbackURL parameter in the email verification endpoint and any other endpoint that accepts callback url. While the server blocks fully qualified URLs, it incorrectly allows scheme-less URLs. This results in the browser interpreting the URL as a fully qualified URL, leading to unintended redirection. An attacker can exploit this flaw by crafting a malicious verification link and tricking users into clicking it. Upon successful email verification, the user will be automatically redirected to the attacker's website, which can be used for phishing, malware distribution, or stealing sensitive authentication tokens. This CVE is a bypass of the fix for GHSA-8jhw-6pjj-8723/CVE-2024-56734. Version 1.1.21 contains an updated patch.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-02-25 14:28 UTC

CWE

CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Assigner

GitHub_M mitre root

References

5 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/securi…	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
better-auth	better-auth	Affected: < 1.1.20

Show details on NVD website

JSON

To clipboard

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CVE-2024-56734 (GCVE-0-2024-56734)

Vulnerability from nvd – Published: 2024-12-30 16:48 – Updated: 2024-12-30 17:36

Title

Better Auth has an Open Redirect Vulnerability in Verify Email Endpoint

Summary

Better Auth is an authentication library for TypeScript. An open redirect vulnerability has been identified in the verify email endpoint of all versions of Better Auth prior to v1.1.6, potentially allowing attackers to redirect users to malicious websites. This issue affects users relying on email verification links generated by the library. The verify email callback endpoint accepts a `callbackURL` parameter. Unlike other verification methods, email verification only uses JWT to verify and redirect without proper validation of the target domain. The origin checker is bypassed in this scenario because it only checks for `POST` requests. An attacker can manipulate this parameter to redirect users to arbitrary URLs controlled by the attacker. Version 1.1.6 contains a patch for the issue.

Severity

7.9 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-12-30 17:36 UTC

CWE

CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
better-auth	better-auth	Affected: < 1.1.5

Show details on NVD website

JSON

To clipboard

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CVE-2026-53517 (GCVE-0-2026-53517)

Vulnerability from cvelistv5 – Published: 2026-07-15 17:33 – Updated: 2026-07-15 19:21

Title

Better Auth OAuth Provider: Refresh Token Rotation Race Condition Allows Concurrent Replay and Token Family Forking

Summary

Better Auth is an authentication and authorization library for TypeScript. From 1.4.8-beta.7 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint on the refresh_token grant performs a non-atomic read, validate, revoke, and mint sequence on the oauthRefreshToken row, allowing concurrent requests with the same parent refresh token to pass the revoked check and create forked refresh-token families; the vulnerable range also includes embedded better-auth plugin versions before 1.6.0. This issue is fixed in version 1.6.11.

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 19:20 UTC

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version
better-auth	better-auth	Affected: >= 1.4.8-beta.7, < 1.6.0
@better-auth	oauth-provider	Affected: >= 1.6.0, < 1.6.11

Show details on NVD website

JSON

To clipboard

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        "metrics": [
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                "id": "CVE-2026-53517",
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                    "Technical Impact": "total"
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        "dateUpdated": "2026-07-15T17:33:38.943Z",
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        {
          "name": "https://github.com/better-auth/better-auth/security/advisories/GHSA-392p-2q2v-4372",
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            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/better-auth/better-auth/security/advisories/GHSA-392p-2q2v-4372"
        },
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          "name": "https://github.com/better-auth/better-auth/commit/c6918ecc9e3a75892169415d7f6c95b591b6a52d",
          "tags": [
            "x_refsource_MISC"
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        }
      ],
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        "advisory": "GHSA-392p-2q2v-4372",
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      },
      "title": "Better Auth OAuth Provider: Refresh Token Rotation Race Condition Allows Concurrent Replay and Token Family Forking"
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  },
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}

CVE-2026-45337 (GCVE-0-2026-45337)

Vulnerability from cvelistv5 – Published: 2026-07-15 17:31 – Updated: 2026-07-15 18:02

Title

Better Auth: Device authorization approve and deny accept any authenticated session while the user code is pending

Summary

Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the deviceAuthorization plugin treats any authenticated session as the owner of any pending device code because GET /device does not claim the row and POST /device/approve and POST /device/deny short-circuit when userId is unset, allowing an authenticated attacker who learns a valid user_code to bind the polling device to the attacker's account or deny the legitimate flow. This issue is fixed in version 1.6.11.

Severity

7.6 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 18:02 UTC

CWE

CWE-285 - Improper Authorization
CWE-345 - Insufficient Verification of Data Authenticity

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/pull/9573	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
better-auth	better-auth	Affected: >= 1.6.0, < 1.6.11

Show details on NVD website

JSON

To clipboard

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}

CVE-2026-53514 (GCVE-0-2026-53514)

Vulnerability from cvelistv5 – Published: 2026-07-15 17:30 – Updated: 2026-07-18 01:13

Title

Better Auth: Unauthorized invitation acceptance via unverified email match in organization plugin

Summary

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, and in 1.6.14 and later when invitation IDs can be obtained outside the invited mailbox and requireEmailVerificationOnInvitation: true is not enabled, the organization plugin's acceptInvitation, rejectInvitation, getInvitation, and listUserInvitations recipient endpoints use session.user.email and an invitation ID without sufficient verified-email ownership proof, allowing a user with an unverified session for the invited email address to accept an organization invitation after obtaining the invitation ID. This issue is fixed for the original default behavior in version 1.6.11, while 1.6.14 restored compatibility for built-in opaque invitation IDs and leaves affected configurations requiring secure options.

Severity

7.7 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-18 01:12 UTC

CWE

CWE-287 - Improper Authentication
CWE-345 - Insufficient Verification of Data Authenticity
CWE-441 - Unintended Proxy or Intermediary ('Confused Deputy')
CWE-862 - Missing Authorization

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/pull/9577	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
better-auth	better-auth	Affected: < 1.6.11

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
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CVE-2026-53515 (GCVE-0-2026-53515)

Vulnerability from cvelistv5 – Published: 2026-07-15 17:27 – Updated: 2026-07-15 19:30

Title

Better Auth: Privilege escalation via SSO provider registration: missing admin role check in @better-auth/sso

Summary

Better Auth is an authentication and authorization library for TypeScript. From 1.2.10 until 1.6.11, the @better-auth/sso plugin's POST /sso/register endpoint lets any organization member attach a new SSO provider to that organization because registerSSOProvider checks only for a membership row and does not require an owner or admin role, allowing attacker-controlled OIDC or SAML providers to drive /sso/callback/{providerId} organization provisioning. This issue is fixed in version 1.6.11.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 19:29 UTC

CWE

CWE-269 - Improper Privilege Management
CWE-285 - Improper Authorization
CWE-863 - Incorrect Authorization

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/pull/9220	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version
better-auth	better-auth	Affected: >= 1.2.10, < 1.6.11
@better-auth	sso	Affected: >= 1.2.10, < 1.6.11

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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      {
        "metrics": [
          {
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CVE-2026-53512 (GCVE-0-2026-53512)

Vulnerability from cvelistv5 – Published: 2026-07-15 17:18 – Updated: 2026-07-18 01:08

Title

Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider and mcp plugins

Summary

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the legacy oidcProvider and mcp plugins expose OAuth token endpoints whose refresh_token grant authenticates only possession of the bound refreshToken row and matching client_id, without verifying the confidential client's client_secret, allowing an attacker with a valid refresh_token to mint access tokens and rotated refresh tokens through /api/auth/oauth2/token or /api/auth/mcp/token. The @better-auth/oauth-provider package is not affected. This issue is fixed in version 1.6.11.

Severity

9.1 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-18 01:07 UTC

CWE

CWE-287 - Improper Authentication
CWE-306 - Missing Authentication for Critical Function
CWE-345 - Insufficient Verification of Data Authenticity
CWE-863 - Incorrect Authorization

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/pull/9576	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
better-auth	better-auth	Affected: < 1.6.11

Show details on NVD website

JSON

To clipboard

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CVE-2026-53518 (GCVE-0-2026-53518)

Vulnerability from cvelistv5 – Published: 2026-07-15 17:17 – Updated: 2026-07-15 18:07

Title

Better Auth OAuth Provider: Race Condition in Authorization Code Exchange Enables Multi-Use Code Redemption

Summary

Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint for the authorization_code grant redeems a single-use authorization code through a non-atomic find-then-delete sequence, allowing two concurrent requests to pass the read step and mint independent access tokens, refresh tokens, and ID tokens; legacy /oauth2/token and /mcp/token paths in oidc-provider and mcp plugins share the same primitive. This issue is fixed in version 1.6.11.

Severity

7.6 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 18:07 UTC

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
better-auth	better-auth	Affected: >= 1.6.0, < 1.6.11

Show details on NVD website

JSON

To clipboard

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CVE-2026-53513 (GCVE-0-2026-53513)

Vulnerability from cvelistv5 – Published: 2026-07-15 17:15 – Updated: 2026-07-15 19:29

Title

Better Auth: Server-side request forgery via unvalidated OIDC endpoints on @better-auth/sso provider registration

Summary

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tokenEndpoint, and jwksEndpoint URLs when skipDiscovery: true is set, store them on the ssoProvider row without origin validation, and fetch them during OIDC callback, allowing non-blind server-side request forgery and possible account linking when trustEmailVerified: true is configured. This issue is fixed in version 1.6.11.

Severity

9.6 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 19:28 UTC

CWE

CWE-20 - Improper Input Validation
CWE-345 - Insufficient Verification of Data Authenticity
CWE-441 - Unintended Proxy or Intermediary ('Confused Deputy')
CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/pull/9574	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version
better-auth	better-auth	Affected: >= 0.1.0, < 1.6.11
@better-auth	sso	Affected: >= 0.1.0, < 1.6.11

Show details on NVD website

JSON

To clipboard

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          "name": "https://github.com/better-auth/better-auth/pull/9574",
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      "title": "Better Auth: Server-side request forgery via unvalidated OIDC endpoints on @better-auth/sso provider registration"
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  },
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}

CVE-2026-53516 (GCVE-0-2026-53516)

Vulnerability from cvelistv5 – Published: 2026-07-15 17:13 – Updated: 2026-07-15 17:52

Title

Better Auth: Account takeover via OAuth auto-link to unverified pre-registered email

Summary

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, Better Auth's OAuth callback auto-link gate in handleOAuthUserInfo accepts implicit account linking when the OAuth provider asserts email_verified: true without requiring the local user row's emailVerified field to also be true, allowing an attacker who pre-registers a victim email through /sign-up/email to bind the victim's OAuth identity to the attacker's account. The same primitive affects one-tap, and emailAndPassword.requireEmailVerification: true does not mitigate the link-time verification change. This issue is fixed in version 1.6.11.

Severity

8.3 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 17:51 UTC

CWE

CWE-287 - Improper Authentication
CWE-345 - Insufficient Verification of Data Authenticity

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/pull/9578	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
better-auth	better-auth	Affected: < 1.6.11

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
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CVE-2025-27143 (GCVE-0-2025-27143)

Vulnerability from cvelistv5 – Published: 2025-02-24 22:16 – Updated: 2025-02-25 14:29

Title

Beter Auth has an Open Redirect via Scheme-Less Callback Parameter

Summary

Better Auth is an authentication and authorization library for TypeScript. Prior to version 1.1.21, the application is vulnerable to an open redirect due to improper validation of the callbackURL parameter in the email verification endpoint and any other endpoint that accepts callback url. While the server blocks fully qualified URLs, it incorrectly allows scheme-less URLs. This results in the browser interpreting the URL as a fully qualified URL, leading to unintended redirection. An attacker can exploit this flaw by crafting a malicious verification link and tricking users into clicking it. Upon successful email verification, the user will be automatically redirected to the attacker's website, which can be used for phishing, malware distribution, or stealing sensitive authentication tokens. This CVE is a bypass of the fix for GHSA-8jhw-6pjj-8723/CVE-2024-56734. Version 1.1.21 contains an updated patch.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-02-25 14:28 UTC

CWE

CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Assigner

GitHub_M mitre root

References

5 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/securi…	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC
https://github.com/better-auth/better-auth/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
better-auth	better-auth	Affected: < 1.1.20

Show details on NVD website

JSON

To clipboard

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CVE-2024-56734 (GCVE-0-2024-56734)

Vulnerability from cvelistv5 – Published: 2024-12-30 16:48 – Updated: 2024-12-30 17:36

Title

Better Auth has an Open Redirect Vulnerability in Verify Email Endpoint

Summary

Better Auth is an authentication library for TypeScript. An open redirect vulnerability has been identified in the verify email endpoint of all versions of Better Auth prior to v1.1.6, potentially allowing attackers to redirect users to malicious websites. This issue affects users relying on email verification links generated by the library. The verify email callback endpoint accepts a `callbackURL` parameter. Unlike other verification methods, email verification only uses JWT to verify and redirect without proper validation of the target domain. The origin checker is bypassed in this scenario because it only checks for `POST` requests. An attacker can manipulate this parameter to redirect users to arbitrary URLs controlled by the attacker. Version 1.1.6 contains a patch for the issue.

Severity

7.9 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-12-30 17:36 UTC

CWE

CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/better-auth/better-auth/securi…	x_refsource_CONFIRM
https://github.com/better-auth/better-auth/commit…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
better-auth	better-auth	Affected: < 1.1.5

Show details on NVD website

JSON

To clipboard

{
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Find a vulnerability

Search criteria

20 vulnerabilities found for better_auth by better-auth

CVE-2026-53518 (GCVE-0-2026-53518)

CVE-2026-53517 (GCVE-0-2026-53517)

CVE-2026-53516 (GCVE-0-2026-53516)

CVE-2026-53515 (GCVE-0-2026-53515)

CVE-2026-53514 (GCVE-0-2026-53514)

CVE-2026-53513 (GCVE-0-2026-53513)

CVE-2026-53512 (GCVE-0-2026-53512)

CVE-2026-45337 (GCVE-0-2026-45337)

CVE-2025-27143 (GCVE-0-2025-27143)

CVE-2024-56734 (GCVE-0-2024-56734)

CVE-2026-53517 (GCVE-0-2026-53517)

CVE-2026-45337 (GCVE-0-2026-45337)

CVE-2026-53514 (GCVE-0-2026-53514)

CVE-2026-53515 (GCVE-0-2026-53515)

CVE-2026-53512 (GCVE-0-2026-53512)

CVE-2026-53518 (GCVE-0-2026-53518)

CVE-2026-53513 (GCVE-0-2026-53513)

CVE-2026-53516 (GCVE-0-2026-53516)

CVE-2025-27143 (GCVE-0-2025-27143)

CVE-2024-56734 (GCVE-0-2024-56734)