CVE-2025-65954
SimpleSAMLphp-casserver has an Open Redirect vulnerability via logout
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
SimpleSAMLphp-casserver has an Open Redirect vulnerability via logout
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.
- Record
CVE-2025-65954- CVSS 3.0
- 4.7 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
EUVDEUVD-2025-209889
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.
- Record
EUVD-2025-209889- CVSS 3.0
- 4.7 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-cvrm-5hp6-h523
SimpleSAMLphp casserver: Open Redirect in logout
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
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,
- Record
GHSA-cvrm-5hp6-h523- CVSS 3.0
- 4.7 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2025-65954- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 3.0
- 4.7 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
OSV
SimpleSAMLphp-casserver has an Open Redirect vulnerability via logout
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.
- Record
CVE-2025-65954- CVSS 3.0
- 4.7 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
OSVGHSA-cvrm-5hp6-h523
SimpleSAMLphp casserver: Open Redirect in logout
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
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,
- Record
GHSA-cvrm-5hp6-h523- CVSS 3.0
- 4.7 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
simplesamlphp/simplesamlphp-module-casserverPackagist |
7.0.0-rc1 up to 7.0.0-rc3 | 7.0.0-rc3 |
simplesamlphp/simplesamlphp-module-casserverPackagist |
before 6.3.1 | 6.3.1 |
simplesamlphp/simplesamlphp-module-casserverPackagist |
7.0.0-rc1 up to 7.0.0, plus listed versions v7.0.0-rc1v7.0.0-rc2v7.0.0-rc3 |
7.0.0 |
simplesamlphp/simplesamlphp-module-casserverPackagist |
before 6.3.1, plus listed versions v6.0.0v6.1.0v6.1.1v6.1.2v6.2.0v6.2.1v6.3.0 |
6.3.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-65954 is a medium vulnerability (CVSS 4.7) in Simplesamlphp Simplesamlphp-module-casserver, published May 15, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.27%, the 19th percentile. Fixed in simplesamlphp/simplesamlphp-module-casserver 7.0.0-rc3.
References
github.com/simplesamlphp/simplesamlphp-module-casserver/security/advisories/GHSA-cvrm-5hp6-h523
nvd.nist.gov/vuln/detail/CVE-2025-65954