Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-47201

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 20.5%
CVSS Severity
CVSS v3 Score 8.5
Products affected by CVE-2026-47201


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