---
id: CVE-2026-77998
title: >-
  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
  Ap…
summary: >-
  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
  Ap…
severity: critical
cvss: 10
cvssVector: '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'
cwe:
  - CWE-639
vendor: miniorange.com
product: SAML SSO Free for Joomla extension for Joomla
affected:
  - saml_sso_free_for_joomla_extension_for_joomla 1.0.0-11.0.1
  - saml_sso_basic_for_joomla_extension_for_joomla 1.0.0-13.1.0
  - saml_sso_standard_for_joomla_extension_for_joomla 1.0.0-24.1.0
  - saml_sso_premium_for_joomla_extension_for_joomla 1.0.0-34.1.0
  - saml_sso_enterprise_for_joomla_extension_for_joomla 1.0.0-44.1.0
  - saml_sp_single_sign_on_login_with_adfs_extension_for_joomla 1.0.0-6.3.0
  - saml_sso_login_with_google_apps_extension_for_joomla 1.0.0-6.3.0
published: '2026-08-25'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T11:17:44.560'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77998'
references:
  - url: 'https://www.miniorange.com/'
    label: security@joomla.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-08-25T14:38:55.305998Z'
cvssSource: cna
epss: 0.00595
epssPercentile: 0.46108
ingestedAt: '2026-09-08T15:33:26.955Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.