CVE-2026-41577

HIGH

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

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 7.5
EPSS 0.0017
EPSS Percentile 6.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-345
Status published
Products (2)
goauthentik/authentik < 2025.12.5 (2 CPE variants)
goauthentik/authentik < 2026.2.3
Published Jun 02, 2026
Tracked Since Jun 03, 2026