• Release Date: December 17, 2025
• Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
• Component: "Single Sign-on with SAML" (md_saml)
• Composer Package Name: mediadreams/md_saml
• Vulnerability Type: Authentication Bypass
• Affected Versions: 3.0.7 and below, 4.0.0 - 4.0.4
• Severity: Critical
• Suggested CVSS v4.0: AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
• References: CVE-2025-66475, CWE-1395

Problem Description

The extension bundles the PHP package “onelogin/php-saml”, which is affected by a Authentication Bypass vulnerability via a Signature Validation Bypass vulnerability in “robrichards/xmlseclibs”.

Solution

Updated versions 3.0.8 and 4.0.5 are available from the TYPO3 extension manager, packagist and at

https://extensions.typo3.org/extension/download/md_saml/3.0.8/zip

https://extensions.typo3.org/extension/download/md_saml/4.0.5/zip

Users of the extension are advised to update the extension as soon as possible.

Credits

Thanks to Christoph Daecke for providing updated versions of the extension.

General Advice

Follow the recommendations that are given in the TYPO3 Security Guide. Please subscribe to the typo3-announce mailing list.