CVE-2026-25922: 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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-25922?
CVE-2026-25922 has been classified as a moderate severity vulnerability due to its potential for signature verification bypass in SAML assertions.
How do I fix CVE-2026-25922?
To mitigate CVE-2026-25922, upgrade to authentik versions 2025.8.6, 2025.10.4, or 2025.12.4, where the issue has been addressed.
What does the vulnerability CVE-2026-25922 entail?
CVE-2026-25922 involves a signature verification bypass via SAML assertion wrapping, which can undermine security measures in authentication.
Which software versions are affected by CVE-2026-25922?
Authentik versions prior to 2025.8.6, 2025.10.4, and 2025.12.4 are affected by CVE-2026-25922.
What are the risks associated with CVE-2026-25922?
The risks associated with CVE-2026-25922 include unauthorized access due to weakened signature verification in SAML assertions.