authentik has a Signature Verification Bypass via SAML Assertion Wrapping
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 0.2%
exploitation probability
0.2%top 87% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
goauthentik · authentikReferences
https://github.com/goauthentik/authentik/releases/tag/version%2F2025.10.4https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.4https://github.com/goauthentik/authentik/releases/tag/version%2F2025.8.6https://github.com/goauthentik/authentik/security/advisories/GHSA-jh35-c4cc-wjm4