SimpleSAMLphp-casserver has an Open Redirect vulnerability via logout

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Summary

CVECVE-2025-65954
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-18 20:16:36 UTC
Updated2026-05-18 21:16:39 UTC
DescriptionSimpleSAMLphp-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.

Risk And Classification

Primary CVSS: v3.0 4.7 MEDIUM from [email protected]

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

Problem Types: CWE-601 | CWE-601 CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

VersionSourceTypeScoreSeverityVector
3.0[email protected]Secondary4.7MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
3.0CNADECLARED4.7MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Simplesamlphp Simplesamlphp-module-casserver affected < 6.3.1 Not specified
CNA Simplesamlphp Simplesamlphp-module-casserver affected >= 7.0.0-rc1, < 7.0.0 Not specified

References

ReferenceSourceLinkTags
github.com/simplesamlphp/simplesamlphp-module-casserver/commit/0462f50f0... [email protected] github.com
github.com/simplesamlphp/simplesamlphp-module-casserver/commit/fb6c6f1c7... [email protected] github.com
github.com/simplesamlphp/simplesamlphp-module-casserver/security/advisor... 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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