CVE-2026-41577 | THREATINT

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.

PUBLISHED Reserved 2026-04-21 | Published 2026-06-02 | Updated 2026-06-03 | Assigner GitHub_M

MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-345: Insufficient Verification of Data Authenticity

Product status

< 2025.12.5

affected

< 2026.2.3

affected

References

github.com/...hentik/security/advisories/GHSA-4v4x-x5pr-8gp2

cve.org (CVE-2026-41577)

nvd.nist.gov (CVE-2026-41577)

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