SAML Single Sign On <= 5.4.4 - Unauthenticated Authentication Bypass via SAMLResponse Parameter
| CVE | CVE-2026-15981 |
|---|---|
| CVSS | 9.8 (Critical) |
| Publicly Published | July 23, 2026 |
| Last Updated | July 23, 2026 |
| Researcher |
Supakiad S. (m3ez)
- E-CQURITY (Thailand)
|
Description
The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 5.4.4. This is due to the mo_saml_validate_signature() function performing a loose boolean check on the raw tri-state integer returned by PHP's openssl_verify(), causing an error return value of -1 to be evaluated as truthy and therefore treated as a successful signature verification. This makes it possible for unauthenticated attackers to log in as any existing WordPress user, including administrators, by submitting a crafted SAMLResponse containing an attacker-controlled NameID and a deliberately malformed signature value that triggers an OpenSSL processing error — bypassing verification entirely and resulting in wp_set_auth_cookie() being called for the targeted account.
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
- 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 5.4.5, 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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