CVE-2026-41577: CWE-345: Insufficient Verification of Data Authenticity in goauthentik authentik
authentik is an open-source identity provider. Prior to versions 2025.12.5 and 2026.2.3, the SAML source response processor (ResponseProcessor.parse()) does not validate the Conditions element on assertions. NotBefore, NotOnOrAfter, and AudienceRestriction are all ignored. This allows replay of expired assertions and acceptance of assertions intended for other service providers. This issue has been patched in versions 2025.12.5 and 2026.2.3.
AI Analysis
Technical Summary
The vulnerability (CVE-2026-41577) affects the authentik identity provider's SAML response processing. The ResponseProcessor.parse() method fails to validate critical Conditions elements in SAML assertions, including NotBefore, NotOnOrAfter, and AudienceRestriction. This insufficient verification of data authenticity (CWE-345) allows attackers to replay expired assertions or use assertions intended for other service providers, potentially bypassing intended access controls. The issue is resolved in authentik versions 2025.12.5 and 2026.2.3.
Potential Impact
Exploitation of this vulnerability could allow an attacker to reuse expired SAML assertions or use assertions crafted for different service providers, potentially leading to unauthorized access or impersonation within systems relying on authentik for identity management. The CVSS score of 6.9 reflects a medium severity impact with network attack vector, no privileges or user interaction required, and limited integrity impact.
Mitigation Recommendations
A fix is available and has been implemented in authentik versions 2025.12.5 and 2026.2.3. Users should upgrade to one of these versions or later to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
CVE-2026-41577: CWE-345: Insufficient Verification of Data Authenticity in goauthentik authentik
Description
authentik is an open-source identity provider. Prior to versions 2025.12.5 and 2026.2.3, the SAML source response processor (ResponseProcessor.parse()) does not validate the Conditions element on assertions. NotBefore, NotOnOrAfter, and AudienceRestriction are all ignored. This allows replay of expired assertions and acceptance of assertions intended for other service providers. This issue has been patched in versions 2025.12.5 and 2026.2.3.
CVSS v4.0
Score 6.9medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability (CVE-2026-41577) affects the authentik identity provider's SAML response processing. The ResponseProcessor.parse() method fails to validate critical Conditions elements in SAML assertions, including NotBefore, NotOnOrAfter, and AudienceRestriction. This insufficient verification of data authenticity (CWE-345) allows attackers to replay expired assertions or use assertions intended for other service providers, potentially bypassing intended access controls. The issue is resolved in authentik versions 2025.12.5 and 2026.2.3.
Potential Impact
Exploitation of this vulnerability could allow an attacker to reuse expired SAML assertions or use assertions crafted for different service providers, potentially leading to unauthorized access or impersonation within systems relying on authentik for identity management. The CVSS score of 6.9 reflects a medium severity impact with network attack vector, no privileges or user interaction required, and limited integrity impact.
Mitigation Recommendations
A fix is available and has been implemented in authentik versions 2025.12.5 and 2026.2.3. Users should upgrade to one of these versions or later to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-21T14:15:21.958Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1f348ce29bf47b50fa1ffc
Added to database: 6/2/2026, 7:52:44 PM
Last enriched: 6/2/2026, 8:04:29 PM
Last updated: 6/3/2026, 4:38:33 AM
Views: 6
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