CVE-2026-25922

authentik has a Signature Verification Bypass via SAML Assertion Wrapping

State: Published
Severity: 8.8 High
Published: Feb 12, 2026
Updated: Feb 17, 2026
Reserved: Feb 9, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-287 Improper Authentication
CWE-347 Improper Verification of Cryptographic Signature

Affected Products

Product	Versions
authentikgoauthentik	< 2025.8.6Affected >= 2025.10.0-rc1, < 2025.10.4Affected >= 2025.10.0-rc1, < 2025.12.4Affected

References

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