CVE-2026-77998: Miniorange.com SAML SP Single Sign On – Login With Adfs Extension For Joomla

Critical severity, CVSS 10.0. EPSS: 0.6% chance of exploitation in the next 30 days.

Joomla Extension - miniorange.com - Unauthenticated Authentication Bypass via SAMLResponse Parameter in miniOrange SAML SSO < 11.0.2, SAML SP Single Sign On – Login with ADFS < 6.4, SAML SP Single Sign On – SAML SSO login with Google Apps < 6.4 - 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 Joomla 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.

Affected products

• Miniorange.com SAML SP Single Sign On – Login With Adfs Extension For Joomla: version 1.0.0-6.3.0 only
• Miniorange.com SAML SSO Basic For Joomla Extension For Joomla: version 1.0.0-13.1.0 only
• Miniorange.com SAML SSO Enterprise For Joomla Extension For Joomla: version 1.0.0-44.1.0 only
• Miniorange.com SAML SSO Free For Joomla Extension For Joomla: version 1.0.0-11.0.1 only
• Miniorange.com SAML SSO Login With Google Apps Extension For Joomla: version 1.0.0-6.3.0 only
• Miniorange.com SAML SSO Premium For Joomla Extension For Joomla: version 1.0.0-34.1.0 only
• Miniorange.com SAML SSO Standard For Joomla Extension For Joomla: version 1.0.0-24.1.0 only

Published 2026-08-25. Last modified 2026-09-08.