Vulnerabilidad · Publicado 29/08/2026 · Actualizado 30/08/2026
El plugin SAML Single Sign On – SSO Login para WordPress (versiones ≤5.4.6) contiene una vulnerabilidad de elusión de autenticación que permite a atacantes validar certificados X.509 antes de completar la verificación de firma en la respuesta SAML. En LATAM, donde muchas empresas integran WordPress con sistemas de identidad corporativa SAML, esta falla expone credenciales y acceso no autorizado a portales internos, clientes y plataformas e-commerce.
The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass in versions up to, and including, 5.4.6. This is due to the mo_saml_login_validate() ACS handler persisting the X.509 certificate extracted from an incoming SAMLResponse into the mo_saml_required_certificate option before the signature-validation verdict is enforced, because mo_saml_find_certificate() returns false on a fingerprint mismatch rather than halting execution. This makes it possible for unauthenticated attackers to overwrite the plugin's stored IdP signing certificate with an attacker-controlled value, and subsequently forge SAML assertions for any WordPress account — including administrators — to obtain a fully privileged session. Note: The exploit requires the administrator to perform a repair after receiving the test_config_error_wpsamlerr004 error message during the test configuration.
Score: 7.5/10 — Severidad: HIGH — Estado NIST: Received
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-287
Publicado en NIST NVD.