SAML Single Sign On <= 5.4.3 - Unauthenticated Authentication Bypass via 'SAMLResponse' Parameter Signature Algorithm Confusion
| CVE | CVE-2026-15013 |
|---|---|
| CVSS | 9.8 (Critical) |
| Publicly Published | July 15, 2026 |
| Last Updated | July 16, 2026 |
| Researcher |
lhking
|
Description
The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass via SAML Signature Algorithm Confusion in all versions up to, and including, 5.4.3. The vulnerability exists because `Mo_SAML_Utilities::mo_saml_cast_key()` reads the `SignatureMethod` Algorithm attribute directly from the attacker-controlled `SAMLResponse` parameter rather than enforcing the locally configured algorithm, causing the plugin to recast the IdP's RSA public key as an HMAC-SHA1 shared secret and validate the forged signature against it. This makes it possible for unauthenticated attackers to forge a SAML assertion targeting any WordPress account — including administrators — obtain valid WordPress authentication cookies, and achieve full administrator-level account takeover.
References
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- 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 5.4.4, 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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