CVE-2026-41577CWE-345

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

Medium · published June 2, 2026

CVSS v4.0
6.9
EPSS
0%
Percentile
8.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
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
EPSS
0.00195 · 8.7th percentile
Weakness
CWE-345 · Insufficient Verification of Data Authenticity
Published
2026-06-02T17:12Z
EPSS history
Timeline
  • 02 JUN 17:12Z
    authentik: SAML source does not validate Conditions, timing, or audience on assertions
    cvelistv5