Common Weakness Enumeration

CWE-303

Allowed

Incorrect Implementation of Authentication Algorithm

Abstraction: Base · Status: Draft

API response cwe.mitre.org

The requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect.

199 vulnerabilities reference this CWE, most recent first.

CVE-2026-11430 (GCVE-0-2026-11430)

Vulnerability from cvelistv5 – Published: 2026-08-07 19:02 – Updated: 2026-10-01 21:44
VLAI
Title
Grav CMS Scheduler Webhook Authentication Bypass via Null Short-Circuit
Summary
Grav CMS's scheduler-webhook plugin contains an authentication bypass in the webhook token check. When the webhook feature is enabled but no webhookToken is configured, a compound conditional short-circuits and skips token validation, so an unauthenticated remote attacker who can reach POST /scheduler/webhook can trigger the operator's already-configured scheduled jobs by sending a single request. The primitive is triggering-existing-jobs, not attacker-chosen command execution: the attacker controls when the jobs run and which one runs (via ?job=), but does not control what the jobs do. Code execution follows only when the operator has configured a job that shells out, and even then the attacker controls timing rather than payload. Not a default-install issue: reaching the endpoint requires the separate scheduler-webhook GPM plugin to be installed, scheduler.modern.webhook.enabled to be true (default false), and no webhookToken to be configured; a stock Grav or Grav-Admin install exposes nothing here.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-07 20:56 UTC
CWE
  • CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6250 records in the last 180 days details
References
Impacted products
Date Public
2026-08-07 00:00
Credits
Saidakbarxon Maxsudxonov and Usmon Khudoyorov
Show details on NVD website
To clipboard 

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CVE-2026-10050 (GCVE-0-2026-10050)

Vulnerability from cvelistv5 – Published: 2026-08-04 11:02 – Updated: 2026-08-04 12:46
VLAI
Title
Digest authentication lossy encoding
Summary
In Eclipse Jetty, the Digest authentication server-side component uses ISO-8859-1 to encode the password as bytes. This was done because the initial specification for HTTP did not specify explicitly a charset, and it was assumed to be ISO-8859-1 for historical reasons. If the password contains characters that cannot be represented in ISO-8859-1, they are silently replaced by `?`. This happens with passwords that contain Chinese, Cyrillic or Greek characters, for example: `αβ123` converts to `??123`. An attacker can send a request with a digest `Authorization` header crafted with a password made of only `?` characters; the server would match any password of the same length that contains non-ISO-8859-1 characters. Recent HTTP Digest [RFC-7616](https://datatracker.ietf.org/doc/html/rfc7616) supports a `charset` parameters that defaults to UTF-8 that allows for correct encoding/decoding of passwords.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-04 12:45 UTC
CWE
Assigner
eclipse CNA under the mitre root
CNA scorecard C 63/100 over 146 records in the last 180 days details
References
Impacted products
Vendor Product Version
Eclipse Foundation Eclipse Jetty - EE8 Affected: 12.0.0 , ≤ 12.0.35 (semver)
Affected: 12.1.0 , ≤ 12.1.9 (semver)
Create a notification for this product.
Eclipse Foundation Eclipse Jetty - EE9 Affected: 12.0.0 , ≤ 12.0.35 (semver)
Affected: 12.1.0 , ≤ 12.1.9 (semver)
Create a notification for this product.
Eclipse Foundation Eclipse Jetty Affected: 9.4.0 , ≤ 9.4.62 (semver)
Affected: 10.0.0 , ≤ 10.0.30 (semver)
Affected: 11.0.0 , ≤ 11.0.30 (semver)
Affected: 12.0.0 , ≤ 12.0.35 (semver)
Affected: 12.1.0 , ≤ 12.1.9 (semver)
Create a notification for this product.
Credits
https://github.com/hrykx-zy
Show details on NVD website
To clipboard 

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CVE-2026-9854 (GCVE-0-2026-9854)

Vulnerability from cvelistv5 – Published: 2026-09-03 07:55 – Updated: 2026-09-03 12:48
VLAI
Summary
A vulnerability exists in SYS600 RBAC mechanism where users having access to the engineering tools could elevate their privileges to administrator level on the underlying Windows host, granting themselves full control over the host machine.
Severity
8.5 (High)
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-03 12:48 UTC
CWE
  • CWE-303 - Incorrect implementation of authentication algorithm
Assigner
Hitachi Energy CNA
CNA scorecard C 68/100 over 12 records in the last 180 days details
References
Impacted products
Vendor Product Version
Hitachi Energy MicroSCADA SYS600 Affected: 10.0 , ≤ 10.7 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-9853 (GCVE-0-2026-9853)

Vulnerability from cvelistv5 – Published: 2026-09-03 07:53 – Updated: 2026-09-03 12:49
VLAI
Summary
A vulnerability exists in SYS600 which allows any user authenticated to the operating system of the server hosting the application to read and modify application objects without being authenticated to the SYS600 system itself. Only the SYS600 system users should be permitted to view and modify application objects.
Severity
8.5 (High)
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-03 12:49 UTC
CWE
  • CWE-303 - Incorrect implementation of authentication algorithm
Assigner
Hitachi Energy CNA
CNA scorecard C 68/100 over 12 records in the last 180 days details
References
Impacted products
Vendor Product Version
Hitachi Energy MicroSCADA SYS600 Affected: 10.0 , ≤ 10.8 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-8922 (GCVE-0-2026-8922)

Vulnerability from cvelistv5 – Published: 2026-05-19 06:27 – Updated: 2026-06-26 06:46
VLAI
Title
Org.keycloak/keycloak-services: keycloak: org.keycloak.protocol.oidc: security flaw in org.keycloak/keycloak-services
Summary
A flaw was found in Keycloak. When both realm-level and client-level `notBefore` revocation policies are configured, Keycloak's OpenID Connect (OIDC) Introspection feature fails to properly honor the realm-level policy. This allows tokens that should have been revoked to remain active, potentially leading to unauthorized access or continued session validity. This could impact the security of systems utilizing Keycloak for identity and access management.
Severity
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-19 12:53 UTC
CWE
  • CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1025 records in the last 180 days details
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:25097 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25098 vendor-advisoryx_refsource_REDHAT
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https://bugzilla.redhat.com/show_bug.cgi?id=2479586 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat build of Keycloak 26.4 Unaffected: 26.4.13-1 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.4::el9
Create a notification for this product.
Red Hat Red Hat build of Keycloak 26.4 Unaffected: 26.4-19 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.4::el9
Create a notification for this product.
Red Hat Red Hat build of Keycloak 26.4.13     cpe:/a:redhat:build_keycloak:26.4::el9
Create a notification for this product.
Red Hat Red Hat build of Keycloak 26.6 Unaffected: 26.6.3-3 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.6::el9
Create a notification for this product.
Red Hat Red Hat build of Keycloak 26.6 Unaffected: 26.6-6 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.6::el9
Create a notification for this product.
Red Hat Red Hat build of Keycloak 26.6.3     cpe:/a:redhat:build_keycloak:26.6::el9
Create a notification for this product.
Date Public
2026-05-19 06:22
Credits
Red Hat would like to thank Joy Gilbert and Reynaldo Immanuel for reporting this issue.
Show details on NVD website
To clipboard 

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CVE-2026-3869 (GCVE-0-2026-3869)

Vulnerability from cvelistv5 – Published: 2026-09-11 15:13 – Updated: 2026-09-11 19:14
VLAI
Summary
CWE-303 : Incorrect Implementation of Authentication Algorithm vulnerability exists that could cause loss of confidentiality, integrity and availability of the PLC provided an application project with a lower application level is running on the PLC.
Severity
9.2 (Critical)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-11 19:14 UTC
CWE
  • CWE-303 - Incorrect implementation of authentication algorithm
Assigner
schneider CNA under the mitre root
CNA scorecard C 65/100 over 23 records in the last 180 days details
References
Impacted products
Vendor Product Version
Schneider Electric Modicon M580 Affected: All versions with an application level below 4.00
Create a notification for this product.
Schneider Electric Modicon M580 Safety Affected: All versions with an application level below 4.20
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-0999 (GCVE-0-2026-0999)

Vulnerability from cvelistv5 – Published: 2026-02-16 09:47 – Updated: 2026-02-17 16:53
VLAI
Title
Authentication bypass via userID login when email and username login are disabled
Summary
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate login method restrictions which allows an authenticated user to bypass SSO-only login requirements via userID-based authentication. Mattermost Advisory ID: MMSA-2025-00548
Severity
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-17 16:52 UTC
CWE
  • CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
Mattermost CNA under the mitre root
CNA scorecard B 80/100 over 122 records in the last 180 days details
References
URL Tags
https://mattermost.com/security-updates vendor-advisory
Impacted products
Vendor Product Version
Mattermost Mattermost Affected: 11.1.0 , ≤ 11.1.2 (semver)
Affected: 10.11.0 , ≤ 10.11.9 (semver)
Affected: 11.2.0 , ≤ 11.2.1 (semver)
Unaffected: 11.3.0
Unaffected: 11.1.3
Unaffected: 10.11.10
Unaffected: 11.2.2
Create a notification for this product.
Credits
daw10
Show details on NVD website
To clipboard 

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CVE-2025-66489 (GCVE-0-2025-66489)

Vulnerability from cvelistv5 – Published: 2025-12-03 19:44 – Updated: 2025-12-03 21:48
VLAI
Title
Cal.com Authentication Bypass via bad TOTP + password checks
Summary
Cal.com is open-source scheduling software. Prior to 5.9.8, A flaw in the login credentials provider allows an attacker to bypass password verification when a TOTP code is provided, potentially gaining unauthorized access to user accounts. This issue exists due to problematic conditional logic in the authentication flow. This vulnerability is fixed in 5.9.8.
Severity
9.9 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-03 21:48 UTC
CWE
  • CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7712 records in the last 180 days details
References
Impacted products
Vendor Product Version
calcom cal.com Affected: < 5.9.8
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2025-61783 (GCVE-0-2025-61783)

Vulnerability from cvelistv5 – Published: 2025-10-09 20:57 – Updated: 2025-10-15 19:49
VLAI
Title
Python Social Auth - Django has unsafe account association
Summary
Python Social Auth is a social authentication/registration mechanism. In versions prior to 5.6.0, upon authentication, the user could be associated by e-mail even if the `associate_by_email` pipeline was not included. This could lead to account compromise when a third-party authentication service does not validate provided e-mail addresses or doesn't require unique e-mail addresses. Version 5.6.0 contains a patch. As a workaround, review the authentication service policy on e-mail addresses; many will not allow exploiting this vulnerability.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-15 19:49 UTC
CWE
  • CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7712 records in the last 180 days details
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2025-57808 (GCVE-0-2025-57808)

Vulnerability from cvelistv5 – Published: 2025-09-02 00:26 – Updated: 2025-09-02 14:03
VLAI
Title
ESP-IDF web_server basic auth bypass using empty or incomplete Authorization header
Summary
ESPHome is a system to control microcontrollers remotely through Home Automation systems. In version 2025.8.0 in the ESP-IDF platform, ESPHome's web_server authentication check can pass incorrectly when the client-supplied base64-encoded Authorization value is empty or is a substring of the correct value. This allows access to web_server functionality (including OTA, if enabled) without knowing any information about the correct username or password. This issue has been patched in version 2025.8.1.
Severity
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-02 14:03 UTC
CWE
  • CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7712 records in the last 180 days details
References
Impacted products
Vendor Product Version
esphome esphome Affected: = 2025.8.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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        {
          "lang": "en",
          "value": "ESPHome is a system to control microcontrollers remotely through Home Automation systems. In version 2025.8.0 in the ESP-IDF platform, ESPHome\u0027s web_server authentication check can pass incorrectly when the client-supplied base64-encoded Authorization value is empty or is a substring of the correct value. This allows access to web_server functionality (including OTA, if enabled) without knowing any information about the correct username or password. This issue has been patched in version 2025.8.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-303",
              "description": "CWE-303: Incorrect Implementation of Authentication Algorithm",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-02T00:26:09.017Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/esphome/esphome/security/advisories/GHSA-mxh2-ccgj-8635",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/esphome/esphome/security/advisories/GHSA-mxh2-ccgj-8635"
        },
        {
          "name": "https://github.com/esphome/esphome/commit/2aceb56606ec8afec5f49c92e140c8050a6ccbe5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/esphome/esphome/commit/2aceb56606ec8afec5f49c92e140c8050a6ccbe5"
        }
      ],
      "source": {
        "advisory": "GHSA-mxh2-ccgj-8635",
        "discovery": "UNKNOWN"
      },
      "title": "ESP-IDF web_server basic auth bypass using empty or incomplete Authorization header"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-57808",
    "datePublished": "2025-09-02T00:26:09.017Z",
    "dateReserved": "2025-08-20T14:30:35.010Z",
    "dateUpdated": "2025-09-02T14:03:58.777Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

No mitigation information available for this CWE.

CAPEC-90: Reflection Attack in Authentication Protocol

An adversary can abuse an authentication protocol susceptible to reflection attack in order to defeat it. Doing so allows the adversary illegitimate access to the target system, without possessing the requisite credentials. Reflection attacks are of great concern to authentication protocols that rely on a challenge-handshake or similar mechanism. An adversary can impersonate a legitimate user and can gain illegitimate access to the system by successfully mounting a reflection attack during authentication.

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