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NVD 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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
🚨 HIGH SEVERITY: CVE-2026-41577 (CVSS 7.5) authentik identity provider fails to validate SAML assertions, allowing replay attacks & acceptance of assertions for other SPs. Patched in v2025.12.5 & v2026.2.3 #CVE #Vulnerability #PatchNow https://t.co/ATHU9Fn4FQ
Post summary
The tweet discloses CVE‑2026‑41577 details and highlights that patches are available (v2025.12.5 and v2026.2.3).
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | goauthentik | authentik | - | - | - |