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MEDIUM severity

SimpleSAMLphp casserver: Open Redirect in logoutGHSA-cvrm-5hp6-h523

MEDIUMFix: simplesamlphp/simplesamlphp-module-casserver@0462f50

GHSA-cvrm-5hp6-h523 is a medium-severity (CVSS 4.7) Open Redirect vulnerability in simplesamlphp/simplesamlphp-module-casserver. A fix is available for simplesamlphp/simplesamlphp-module-casserver — see the affected versions and patch details below.

Also known asCVE-2025-65954
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 12, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for GHSA-cvrm-5hp6-h523.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs19th percentile — riskier than 19% of all scored CVEsHighest risk
0.00%0.26%0.51%0.77%0.0%0.3%Jun 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🐘simplesamlphp/simplesamlphp-module-casserver🐘simplesamlphp/simplesamlphp-module-casserver

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Summary

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.

There are a number of other things broken with logout in 7 (cas v3 uses a different query parameters, etc)

Details

https://github.com/simplesamlphp/simplesamlphp-module-casserver/blob/21418f7efbea8c4f078fd4a7d1b9eacf94dd4941/src/Controller/LogoutController.php#L104

Previous module checked the url against the valid service urls.

PoC

The docker instructions from the README.md run an image with a vulnerable config.

Accessing https://localhost/cas/logout?url=https://google.com will redirect to Google

Impact

Impacted configs have

'enable_logout' => true,

and are most impacted if they also have

'skip_logout_page' -> true,

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistsimplesamlphp/simplesamlphp-module-casserver≥ 7.0.0-rc1&&< 7.0.07.0.0composer require simplesamlphp/simplesamlphp-module-casserver:^7.0.0
🐘Packagistsimplesamlphp/simplesamlphp-module-casserverall versions6.3.1composer require simplesamlphp/simplesamlphp-module-casserver:^6.3.1

Affected Products

1 product · 3 configurations
Application
simplesamlphp-module-casserversimplesamlphp
< 6.3.1
1 version
7.0.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for simplesamlphp/simplesamlphp-module-casserver, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update simplesamlphp/simplesamlphp-module-casserver to 7.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-cvrm-5hp6-h523 is resolved across your whole dependency graph.

  3. Workarounds

    Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

Frequently Asked Questions

### Summary 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. There are a number of other things broken with logout in 7 (cas v3 uses a different query parameters, etc) ### Details https://github.com/simplesamlphp/simplesamlphp-module-casserver/blob/21418f7efbea8c4f078fd4a7d1b9eacf94dd4941/src/Controller/LogoutController.php#L104 Previous module checked the url against the valid service u
O3 Security · Impact-Aware SCA

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SimpleSAMLphp casserver: Open Redirect in logout