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CVE PROGRAM SOURCE RECORD8.5 High

CVE-2026-47201

authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary federated user

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Status
Published
Published
Updated
Assigning organization
GitHub_M

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

goauthentik authentik

  • < 2025.12.5affected
  • < 2026.2.3affected
  • < 2026.5.1affected

References