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Vulnerability · Published Aug 25, 2026 · Assigned by Joomla

CVE-2026-77998Joomla 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

Critical 10.0

In plain English

A critical-severity authorization bypass via user-controlled key in SAML SP Single Sign On – Login with ADFS extension for Joomla from miniorange.com. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).

Severity (CVSS 4.0)10.0Critical
Exploit odds (30 days)0.6%top 51.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 (as reported)

VendorProductVersions
miniorange.com SAML SSO Free for Joomla extension for Joomla 1.0.0-11.0.1
miniorange.com SAML SSO Basic for Joomla extension for Joomla 1.0.0-13.1.0
miniorange.com SAML SSO Standard for Joomla extension for Joomla 1.0.0-24.1.0
miniorange.com SAML SSO Premium for Joomla extension for Joomla 1.0.0-34.1.0
miniorange.com SAML SSO Enterprise for Joomla extension for Joomla 1.0.0-44.1.0
miniorange.com SAML SP Single Sign On – Login with ADFS extension for Joomla 1.0.0-6.3.0
miniorange.com SAML SSO login with Google Apps extension for Joomla 1.0.0-6.3.0

Weakness: CWE-639 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

References