---
id: CVE-2026-75807
title: >-
  The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to
  Authentication Bypass in versions up to, and including, 5.4.6
summary: >-
  The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to
  Authentication Bypass in versions up to, and including, 5.4.6. This is due to
  the mo_saml_login_validate() ACS handler persisting the X.509 certificate
  extracted f…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-287
published: '2026-08-29'
updated: '2026-08-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75807'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.6/class-mo-saml-login-validate.php#L236
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.6/class-mo-saml-login-validate.php#L292
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.6/class-mo-saml-utilities.php#L739
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/miniorange-saml-20-single-sign-on/tags/5.4.6/mo-saml-settings-page.php#L141
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/9baea072-2c07-40b6-8410-2ebe752b0874?source=cve
    label: security@wordfence.com
tags:
  - nvd
ingestedAt: '2026-08-30T12:52:24.172Z'
epss: 0.0041
epssPercentile: 0.32381
---

## Overview

The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass in versions up to, and including, 5.4.6. This is due to the mo_saml_login_validate() ACS handler persisting the X.509 certificate extracted from an incoming SAMLResponse into the mo_saml_required_certificate option before the signature-validation verdict is enforced, because mo_saml_find_certificate() returns false on a fingerprint mismatch rather than halting execution. This makes it possible for unauthenticated attackers to overwrite the plugin's stored IdP signing certificate with an attacker-controlled value, and subsequently forge SAML assertions for any WordPress account — including administrators — to obtain a fully privileged session. Note: The exploit requires the administrator to perform a repair after receiving the test_config_error_wpsamlerr004 error message during the test configuration.

## Remediation

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