What is CVE-2026-87937?

CVE-2026-87937 is a medium-severity vulnerability in Drupal Central Authentication System (Cas) Server, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.5/10. Published 2026-10-22.

How severe is CVE-2026-87937?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Open Redirect in Drupal Central Authentication System (Cas) Server

CVE-2026-87937

URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Drupal Central Authentication System (CAS) Server allows Fake the Source of Data. This issue affects Central Authentication System (CAS) Server versions: from 0.0.0 to 2.0.4, from 2.1.0 to 2.1.3.

Vulnerability class: Open Redirect

Published 2026-10-22 · last modified 2026-10-22.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Drupal Central Authentication System (Cas) Server

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

www.drupal.org/sa-contrib-2026-135

Frequently asked questions

What is CVE-2026-87937?: CVE-2026-87937 is a medium-severity vulnerability in Drupal Central Authentication System (Cas) Server, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.5/10. Published 2026-10-22.
How severe is CVE-2026-87937?: Medium severity. CVSS v3 base score is 6.5 out of 10.