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8.8

authentik SAML Identity Provider Allows Malicious Assertion Injection

CVE-2026-25922 · published 8 months ago
Summary

Prior versions of authentik's SAML identity provider allowed attackers to inject fake identity information. This happened when certain security settings were not properly configured. Update to the latest version to fix this issue.

What to do
  • Update authentik to version 2025.12.4.
Affected software
Ecosystem VendorProductAffected versions
– goauthentik authentik < 2025.8.6
>= 2025.10.0, < 2025.10.4
>= 2025.12.0, < 2025.12.4
cpe:2.3:a:goauthentik:authentik:*:*:*:*:*:*:*:*
Bitnami – authentik >= 2025.10.0, < 2025.12.4
Fix: upgrade to 2025.12.4
Original advisory text
authentik has a Signature Verification Bypass via SAML Assertion Wrapping
authentik is an open-source identity provider. Prior to 2025.8.6, 2025.10.4, and 2025.12.4, when using a SAML Source that has the option Verify Assertion Signature under Verification Certificate enabled and not Verify Response Signature, or does not have the Encryption Certificate setting under Advanced Protocol settings configured, it was possible for an attacker to inject a malicious assertion before the signed assertion that authentik would use instead. authentik 2025.8.6, 2025.10.4, and 2025.12.4 fix this issue.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
8.8 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-287Improper Authentication
CWE-347Improper Verification of Cryptographic Signature
Timeline
Published12 Feb 2026
Updated4 Nov 2026
First seen6 Mar 2026
Sources
CVE-2026-25922 · NVD
BIT-authentik-2026-25922 · OSV
GHSA-jh35-c4cc-wjm4 · GHSA
CVE-2026-25922 · OSV
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