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8.8
authentik SAML Identity Provider Allows Malicious Assertion Injection
CVE-2026-25922
BIT-authentik-2026-25922
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 | Vendor | Product | Affected 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 title
authentik has a Signature Verification Bypass via SAML Assertion Wrapping
Original description
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.
nvd CVSS3.1
8.8
Vulnerability type
CWE-287
Improper Authentication
CWE-347
Improper Verification of Cryptographic Signature
- https://github.com/goauthentik/authentik/releases/tag/version%2F2025.10.4 Product Release Notes
- https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.4 Product Release Notes
- https://github.com/goauthentik/authentik/releases/tag/version%2F2025.8.6 Product Release Notes
- https://github.com/goauthentik/authentik/security/advisories/GHSA-jh35-c4cc-wjm4 Mitigation Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-25922 URL
Published: 16 Apr 2026 · Updated: 17 Apr 2026 · First seen: 6 Mar 2026