SAML Single Sign On <= 5.4.6 - Unauthenticated Authentication Bypass via X.509 Certificate Poisoning
| CVE | CVE-2026-75807 |
|---|---|
| CVSS | 7.5 (High) |
| Publicly Published | August 29, 2026 |
| Last Updated | August 29, 2026 |
| Researchers |
Tanishq Shah
Thatchapol Booranatanit (AliceZz) |
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.
Learn more about Authentication Bypass vulnerabilities and how to prevent them.
References
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
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Vulnerability Details for SAML Single Sign On – SSO Login
| Software Type | Plugin |
|---|---|
| Software Slug | miniorange-saml-20-single-sign-on (view on wordpress.org) |
| Patched? | Yes |
| Remediation | Update to version 5.4.7, or a newer patched version |
| Affected Version |
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| Patched Version |
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Recent vulnerabilities in SAML Single Sign On – SSO Login
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