Vulnerability 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. Note: The exploit requires the administrator to perform a repair after receiving the test_config_error_wpsamlerr004 error message during the test configuration.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tag
- https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tag
- https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tag
- https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tag
- https://www.wordfence.com/threat-intel/vulnerabilities/id/9baea072-2c07-40b6-841
FAQ
What is CVE-2026-75807?
CVE-2026-75807 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 persist...
How severe is CVE-2026-75807?
CVE-2026-75807 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-75807?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.