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
| # | Title | CVE ID | CVSS | Researchers | Date |
|---|---|---|---|---|---|
| 1 | SAML Single Sign On <= 5.4.3 - Unauthenticated Authentication Bypass via 'SAMLResponse' Parameter Signature Algorithm Confusion | CVE-2026-15013 | lhking | July 15, 2026 | |
| 2 | SAML Single Sign On – SAML SSO Login <= 4.9.20 - Reflected Cross-Site Scripting | June 6, 2022 | |||
| 3 | SAML Single Sign On – SAML SSO Login <= 4.8.83 - Cross-Site Scripting | CVE-2020-6850 | Zeroauth | January 28, 2020 | |
| 4 | SAML Single Sign On – SAML SSO Login < 4.8.73 - Cross-Site Scripting | CVE-2019-12346 | Zeroauth | May 27, 2019 | |
| 5 | SAML Single Sign On – SAML SSO Login <= 4.8.75 - Cross-Site Request Forgery | May 20, 2019 |
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