What’s Vulnerable › Vulnerabilities
CVE-2026-47201: authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary federated user
- Severity: high (CVSS 8.5 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: 2026-06-02 · updated 2026-07-22
- Weakness: CWE-20
Description
authentik is an open-source identity provider. Prior to versions 2025.12.5, 2026.2.3, and 2026.5.1, authentik's SAML Source ACS endpoint is vulnerable to XML Signature Wrapping when validating upstream SAML responses. An attacker with any account at the upstream IdP can reuse a valid signed assertion to authenticate as another federated user. This issue has been patched in versions 2025.12.5, 2026.2.3, and 2026.5.1.
Affected products
- goauthentik authentik: before 2025.12.6; from 2026.2.0 before 2026.2.4; from 2026.5.0 before 2026.5.1 — fixed in 2025.12.6, 2026.2.4, 2026.5.1
How to fix
Upgrade to a fixed version: goauthentik authentik 2025.12.6, 2026.2.4, 2026.5.1. Check the vendor advisory for mitigations.
References
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