CVE-2025-65954: Simplesamlphp Simplesamlphp-Module-Casserver

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

SimpleSAMLphp-casserver is a CAS 1.0 and 2.0 compliant CAS server in the form of a SimpleSAMLphp module. In versions below 6.3.1 and 7.0.0, the logout endpoint accepts a url query parameter to redirect to. casserver treats that url as trusted, and either (depending on configuration) redirects the browser there, or shows a "you've been logged out" page with a link to continue to that url. Impacted configs include 'enable_logout' => true, and 'skip_logout_page' -> true. This issue has been resolved in versions 6.3.1 and 7.0.0.

Affected products

• Simplesamlphp Simplesamlphp-Module-Casserver: before 6.3.1 (fixed in 6.3.1); version 7.0.0 only

Published 2026-05-18. Last modified 2026-10-07.