CVE-2025-65954: SimpleSAMLphp-casserver is a CAS 1.0 and 2.0 compliant CAS server in the form of a SimpleSAMLphp module

Q: How do I fix CVE-2025-65954?

simplesamlphp-module-casserver: upgrade to 6.3.1. Exact commands for each OS are on this page.

Q: Is CVE-2025-65954 being exploited?

CVE-2025-65954 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-65954 affect?

CVE-2025-65954 affects simplesamlphp-module-casserver. Severity is medium (CVSS 6.1). 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 trust

Q: How urgent is CVE-2025-65954?

Priority 31/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2025-65954 is a medium-severity flaw (CVSS 6.1) affecting simplesamlphp-module-casserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-601
Published	2026-05-18
Last modified	2026-10-07

Publisher (CNA): GitHub, Inc. · Vendor: simplesamlphp

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-18 20:16 UTCPublished CVE record published
2026-10-07 08:10 UTCUpdated Record last modified

simplesamlphp simplesamlphp-module-casserver UPGRADE

Affected: < 6.3.1 · 7.0.0 rc1 · 7.0.0 rc2

Fixed in: 6.3.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy simplesamlphp-module-casserver || rpm -q simplesamlphp-module-casserver || simplesamlphp-module-casserver --version

2. UPGRADE to 6.3.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade simplesamlphp-module-casserver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade simplesamlphp-module-casserver

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-65954?

simplesamlphp-module-casserver: upgrade to 6.3.1. Exact commands for each OS are on this page.

Is CVE-2025-65954 being exploited?

CVE-2025-65954 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-65954 affect?

CVE-2025-65954 affects simplesamlphp-module-casserver. Severity is medium (CVSS 6.1). 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 trust

How urgent is CVE-2025-65954?

Priority 31/100. Public exploit reference

References

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