CVE-2026-77998
CriticalCVSS 10.0Summary
Joomla Extension miniOrange SAML SSO (versions < 11.0.2, < 6.4 for SAML SP Single Sign On) has an authentication bypass vulnerability via the SAMLResponse parameter. The mo_saml_validate_signature() function performs a loose boolean check on the result of openssl_verify(), causing an error return value of -1 to be treated as truthy, allowing unauthenticated attackers to log in as any existing Joomla user, including administrators.
Risk Assessment
An unauthenticated attacker can gain access to administrator accounts, leading to full compromise of the Joomla system and data.
Recommendation
Upgrade miniOrange SAML SSO extensions to version 11.0.2 or later (for SAML SP Single Sign On to 6.4 or later).
Original NVD description (English source)
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.