CVE-2026-75807 - SAML Single Sign On = 5.4.6 - Unauthenticated Authentication Bypass via X.509 Certificate Poisoning
Brief
CVE ID : CVE-2026-75807
Published : Aug. 29, 2026, 6:16 p. m.
- 2 hours, 58 minutes ago
Description : The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass in versions up to, and including, 5.
- 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.