CVE-2026-47201 — authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary federated user

CVE-2026-47201

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

Description (CNA)

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 (CNA)

Vendor / product	Versions
goauthentik / authentik	affected < 2025.12.5; affected < 2026.2.3; affected < 2026.5.1

CWE

CWE-20

References

https://github.com/goauthentik/authentik/security/advisories/GHSA-c3m2-jqmq-pvp3

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.