6.1

CVE-2025-65954: simplesamlphp simplesamlphp-module-casserver Open Redirect

CVSS: 6.1v3.1MediumAnalyzed
Published 18-05-2026Last modified 18-05-2026
Open JSON

Vulnerability summary

CVE-2025-65954 is a medium (CVSS 6.1) Open Redirect vulnerability in simplesamlphp simplesamlphp-module-casserver. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 17.9% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
34/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (NVD)
EPSS score
0.27%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Timeline

  1. 18-05-2026
    PublishedVulnerability first disclosed.
  2. 18-05-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

18%

Versus all other CVEs

30-day change

0.00 pp

From 0.27% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.27%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Simplesamlphp Module Casserver

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Simplesamlphp1 product

1 vendor · 1 product

References

3 links