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-2026-43640 (GCVE-0-2026-43640)

Vulnerability from cvelistv5 – Published: 2026-05-11 17:14 – Updated: 2026-07-14 20:01 X_Open Source
VLAI
Title
Bitwarden Server < 2026.4.1 Authentication Bypass via SCIM API Key
Summary
Bitwarden Server prior to v2026.4.1 does not require master-password re-authentication when retrieving or rotating an organization's SCIM API key, allowing an authenticated user with SCIM management privileges to obtain the key using only a valid session.
Severity
8.6 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/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 2026-05-13 12:38 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
Vendor Product Version
bitwarden server Affected: 0 , < 2026.4.1 (semver)
    cpe:2.3:a:bitwarden:server:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-05-05 00:00
Credits
Sanjok Karki
Show details on NVD website
To clipboard 

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CVE-2026-41103 (GCVE-0-2026-41103)

Vulnerability from cvelistv5 – Published: 2026-05-12 16:59 – Updated: 2026-08-10 15:13
VLAI
Title
Microsoft SSO Plugin for Jira & Confluence Elevation of Privilege Vulnerability
Summary
Incorrect implementation of authentication algorithm in Microsoft SSO Plugin for Jira & Confluence allows an unauthorized attacker to elevate privileges over a network.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-07 00:00 UTC
CWE
  • CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
microsoft CNA under the mitre root
CNA scorecard B 82/100 over 3955 records in the last 180 days details
References
Impacted products
Date Public
2026-05-12 14:00
Show details on NVD website
To clipboard 

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CVE-2026-41053 (GCVE-0-2026-41053)

Vulnerability from cvelistv5 – Published: 2026-06-30 11:38 – Updated: 2026-07-01 03:55
VLAI
Title
Over-inclusive team membership expansion in GitHub App authentication provider for Rancher
Summary
Incorrect authentication caching in the team member ship expansion of the Rancher Github authentication provider caused it granting principal access to any logged in user, in 2.13 before 2.13.6 and 2.14 before 2.14.2.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-30 00:00 UTC
CWE
  • CWE-303 - Incorrect implementation of authentication algorithm
Assigner
suse CNA under the mitre root
CNA scorecard B 78/100 over 101 records in the last 180 days details
References
Impacted products
Vendor Product Version
SUSE Rancher Affected: 2.14.0 , < 2.14.2 (semver)
Affected: 2.13.0 , < 2.13.6 (semver)
Create a notification for this product.
Date Public
2026-05-28 11:31
Show details on NVD website
To clipboard 

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CVE-2026-41049 (GCVE-0-2026-41049)

Vulnerability from cvelistv5 – Published: 2026-06-22 15:32 – Updated: 2026-07-08 05:55
VLAI
Title
Caching of Authentication allows Authentication Bypass between users in qSnapper
Summary
Incorrect caching of authentication between different users of the  qSnapper dbus service before version 1.3.3 allowed any local attacker to use dbus functions after a privileged users has authenticated for them.
Severity
8.4 (High)
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/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 2026-06-22 16:25 UTC
CWE
  • CWE-863 - Incorrect Authorization
Assigner
suse CNA under the mitre root
CNA scorecard B 78/100 over 101 records in the last 180 days details
References
Impacted products
Vendor Product Version
presire qSnapper Affected: 1.2.1 , < 1.3.3 (semver)
Create a notification for this product.
Date Public
2026-05-26 15:09
Credits
Matthias Gerstner of SUSE
Show details on NVD website
To clipboard 

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CVE-2026-41048 (GCVE-0-2026-41048)

Vulnerability from cvelistv5 – Published: 2026-06-22 15:31 – Updated: 2026-07-07 09:31
VLAI
Title
Caching of Authentication allows Authentication Bypass in qSnapper
Summary
Incorrect caching of authentication between different polkit methods in qSnapper before version 1.3.3 allowed a local attacker to use functions like "restore from snapshot" even if only allowed to do "delete snapshot".
Severity
8.4 (High)
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/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 2026-06-22 16:24 UTC
CWE
  • CWE-863 - Incorrect Authorization
Assigner
suse CNA under the mitre root
CNA scorecard B 78/100 over 101 records in the last 180 days details
References
Impacted products
Vendor Product Version
presire qSnapper Affected: 1.2.1 , < 1.3.3 (semver)
Create a notification for this product.
Date Public
2026-05-26 15:09
Credits
Matthias Gerstner of SUSE
Show details on NVD website
To clipboard 

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CVE-2026-33190 (GCVE-0-2026-33190)

Vulnerability from cvelistv5 – Published: 2026-05-05 19:02 – Updated: 2026-05-06 12:47
VLAI
Title
CoreDNS TSIG authentication bypass on encrypted DNS transports
Summary
CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the tsig plugin can be bypassed on non-plain-DNS transports (DoT, DoH, DoH3, DoQ, and gRPC) because it trusts the transport writer's TsigStatus() instead of performing verification itself. The DoH and DoH3 writer's TsigStatus() always returns nil, the DoT server does not set TsigSecret on the dns.Server, and the DoQ and gRPC writers also unconditionally return nil. This allows an unauthenticated remote client to bypass TSIG-based authentication and access resources intended to be restricted behind a tsig require all policy. Plain DNS over TCP and UDP are not affected. This issue has been fixed in version 1.14.3.
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 2026-05-06 12:46 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
coredns coredns Affected: < 1.14.3
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-32953 (GCVE-0-2026-32953)

Vulnerability from cvelistv5 – Published: 2026-03-20 04:24 – Updated: 2026-03-20 18:08
VLAI
Title
Tillitis: TKey Client has an Error in Protocol Implementation
Summary
Tillitis TKey Client package is a Go package for a TKey client. Versions 1.2.0 and below contain a critical bug in the tkeyclient Go module which causes 1 out of every 256 User Supplied Secrets (USS) to be silently ignored, producing the same Compound Device Identifier (CDI)—and thus the same key material—as if no USS is provided. This happens because a buffer index error overwrites the USS-enabled boolean with the first byte of the USS digest, so any USS whose hash starts with 0x00 is effectively discarded. This issue has been fixed in version 1.3.0. Users unable to upgrade immediately should switch to a USS whose hash does not begin with a zero byte.
Severity
4.7 (Medium)
CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:H/SI:H/SA:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-20 16:34 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
tillitis tkeyclient Affected: < 1.3.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-29515 (GCVE-0-2026-29515)

Vulnerability from cvelistv5 – Published: 2026-03-11 03:23 – Updated: 2026-07-28 01:48 Unsupported When Assigned
VLAI
Title
MiCode FileExplorer SwiFTP Server Authentication Bypass
Summary
MiCode FileExplorer contains an authentication bypass vulnerability in the embedded SwiFTP FTP server component that allows network attackers to log in without valid credentials. Attackers can send arbitrary username and password combinations to the PASS command handler, which unconditionally grants access and allows listing, reading, writing, and deleting files exposed by the FTP server. The MiCode/Explorer open source project has reached end-of-life status.
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/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 2026-03-11 15:38 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
Vendor Product Version
MiCode FileExplorer Affected: 0
    cpe:2.3:a:file_explorer_project:file_explorer:0:*:*:*:*:ipados:*:*
Create a notification for this product.
Credits
XavLimSG VulnCheck
Show details on NVD website
To clipboard 

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CVE-2026-27656 (GCVE-0-2026-27656)

Vulnerability from cvelistv5 – Published: 2026-03-25 16:28 – Updated: 2026-03-26 13:19
VLAI
Title
Account Takeover via Substring Matching in OpenID Connect Authentication
Summary
Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to properly validate user identity in the OpenID {{IsSameUser()}} comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user discovery flow.. Mattermost Advisory ID: MMSA-2026-00590
Severity
5.7 (Medium)
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/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 2026-03-26 03:55 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: 11.4.0 , ≤ 11.4.0 (semver)
Affected: 11.3.0 , ≤ 11.3.1 (semver)
Affected: 11.2.0 , ≤ 11.2.3 (semver)
Affected: 10.11.0 , ≤ 10.11.11 (semver)
Unaffected: 11.5.0
Unaffected: 11.4.1
Unaffected: 11.3.2
Unaffected: 11.2.4
Unaffected: 10.11.12
Create a notification for this product.
Credits
Christopher Poile
Show details on NVD website
To clipboard 

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CVE-2026-15688 (GCVE-0-2026-15688)

Vulnerability from cvelistv5 – Published: 2026-09-17 08:15 – Updated: 2026-10-09 00:45
VLAI
Title
Password Authentication Bypass Vulnerability in GX Works3 and Motion Control Setting
Summary
Incorrect Implementation of Authentication Algorithm Vulnerability in Mitsubishi Electric GX Works3 and Motion Control Setting allows a local attacker to successfully authenticate even with an invalid block password by executing the affected product and modifying part of the executable module in memory, and thereby may be able to view, tamper with, destroy, or delete control programs.
Severity
9.2 (Critical)
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:H/SA:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 12:24 UTC
CWE
  • CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
Mitsubishi CNA under the jpcert root
CNA scorecard – unranked: 8 records in the last 180 days, 10 needed details
References
Impacted products
Show details on NVD website
To clipboard 

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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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