How severe is CVE-2025-65954?

CVE-2025-65954 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-65954 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-65954?

CVE-2025-65954 primarily affects Simplesamlphp Simplesamlphp-module-casserver. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-65954?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-65954 have an EU (EUVD) identifier?

Yes. CVE-2025-65954 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-209889.

When was CVE-2025-65954 published?

CVE-2025-65954 was published on 2026-05-18 and last updated on 2026-06-17.

CVE-2025-65954

CVE-2025-65954 is a medium-severity vulnerability in Simplesamlphp Simplesamlphp-module-casserver with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-601.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-209889
Weakness: CWE-601
Affected product: Simplesamlphp Simplesamlphp-module-casserver
Published: 2026-05-18
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-65954?: 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.
How severe is CVE-2025-65954?: CVE-2025-65954 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-65954 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-65954?: CVE-2025-65954 primarily affects Simplesamlphp Simplesamlphp-module-casserver. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-65954?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-65954 have an EU (EUVD) identifier?: Yes. CVE-2025-65954 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-209889.
When was CVE-2025-65954 published?: CVE-2025-65954 was published on 2026-05-18 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:simplesamlphp:simplesamlphp-module-casserver:*:*:*:*:*:*:*:*
cpe:2.3:a:simplesamlphp:simplesamlphp-module-casserver:7.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:simplesamlphp:simplesamlphp-module-casserver:7.0.0:rc2:*:*:*:*:*:*

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