CVE-2026-41577

authentik: SAML source does not validate Conditions, timing, or audience on assertions

State: Published
Severity: 6.9 Medium
Published: Jun 2, 2026
Updated: Jun 3, 2026
Reserved: Apr 21, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-345 Insufficient Verification of Data Authenticity

Affected Products

Product	Versions
authentikgoauthentik	< 2025.12.5Affected < 2026.2.3Affected

References

https://github.com/goauthentik/authentik/security/advisories/GHSA-4v4x-x5pr-8gp2

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