Open Redirect in Simplesamlphp Simplesamlphp-Casserver
CVE-2025-65954
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.
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (17.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Simplesamlphp Simplesamlphp-Casserver — versions 7.0.0
- Simplesamlphp Casserver — versions 7.0.0
- Simplesamlphp Simplesamlphp-Module-Casserver — versions >= 7.0.0-rc1, < 7.0.0, 7.0.0, < 6.3.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2025-65954?
- CVE-2025-65954 is a medium-severity vulnerability in Simplesamlphp Simplesamlphp-Casserver, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2026-05-18.
- How severe is CVE-2025-65954?
- Medium severity. CVSS v3 base score is 6.1 out of 10.