CVE-2026-41577 PUBLISHED

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

Assigner: GitHub_M
Reserved: 21.04.2026 Published: 02.06.2026 Updated: 03.06.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	goauthentik
Product	authentik
Versions	Version < 2025.12.5 is affected Version < 2026.2.3 is affected

References

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

Problem Types

CWE-345: Insufficient Verification of Data Authenticity CWE