MiniOrange SAML SSO Extension up to 11.0.1 SAML Signature Verification mo_saml_validate_signature SAMLResponse improper authentication

Summaryinfo

A vulnerability, which was classified as critical, was found in MiniOrange SAML SSO Extension up to 11.0.1. This affects the function mo_saml_validate_signature of the component SAML Signature Verification. The manipulation of the argument SAMLResponse results in improper authentication. This vulnerability is known as CVE-2026-77998. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, was found in MiniOrange SAML SSO Extension up to 11.0.1. Affected is the function mo_saml_validate_signature of the component SAML Signature Verification. The manipulation of the argument SAMLResponse with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at miniorange.com. This vulnerability is traded as CVE-2026-77998 since 08/21/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

Upgrading to version 11.0.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-65476). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• MiniOrange

Name

• SAML SSO Extension

Version

• 11.0.0
• 11.0.1

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CPE 2.2info

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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