VULNERABILITY INTELLIGENCE

CVE-2025-27773

CVSS score8.6 HIGH

EPSS probability0.41%

CISA KEVNot currently listed

Published2025-03-11

Last modified2026-06-17

Description

The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.17.0 and 5.0.0-alpha.20, there is a signature confusion attack in the HTTPRedirect binding. An attacker with any signed SAMLResponse via the HTTP-Redirect binding can cause the application to accept an unsigned message. Versions 4.17.0 and 5.0.0-alpha.20 contain a fix for the issue.