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CVE-2026-75807 - SAML Single Sign On = 5.4.6 - Unauthenticated Authentication Bypass via X.509 Certificate Poisoning

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. 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.

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cve-2026-75807

SAML Single Sign On = 5. 4. 6 - Unauthenticated Authentication Bypass via X. 509 Certificate Poisoning

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