CVE-2026-25922CWE-287CWE-347

authentik has a Signature Verification Bypass via SAML Assertion Wrapping

High · published February 12, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
25.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00335 · 25.7th percentile
Weaknesses
CWE-287 · Improper Authentication; CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-02-12T19:38Z
EPSS history
Timeline
  • 12 FEB 19:38Z
    authentik has a Signature Verification Bypass via SAML Assertion Wrapping
    cvelistv5