What’s Vulnerable › Vulnerabilities

CVE-2026-25922: authentik has a Signature Verification Bypass via SAML Assertion Wrapping

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-12 · updated 2026-06-17
• Weakness: CWE-287

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.

Affected products

• goauthentik authentik: before 2025.8.6; from 2025.10.0 before 2025.10.4; from 2025.12.0 before 2025.12.4 — fixed in 2025.10.4, 2025.12.4, 2025.8.6

How to fix

Upgrade to a fixed version: goauthentik authentik 2025.10.4, 2025.12.4, 2025.8.6. Check the vendor advisory for mitigations.

References

• https://github.com/goauthentik/authentik/releases/tag/version%2F2025.10.4
• https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.4
• https://github.com/goauthentik/authentik/releases/tag/version%2F2025.8.6
• https://github.com/goauthentik/authentik/security/advisories/GHSA-jh35-c4cc-wjm4

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