CVE-2026-87937: Central Authentication System (CAS) Server - Moderately critical - Open redirect - SA-CONTRIB-2026-135

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-22 · updated 2026-10-22
Weakness: CWE-601

Description

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.

Affected products

Drupal Central Authentication System (CAS) Server: before 2.0.4; from 2.1.0 before 2.1.3 — fixed in 2.0.4, 2.1.3

How to fix

Upgrade to a fixed version: Drupal Central Authentication System (CAS) Server 2.0.4, 2.1.3. Check the vendor advisory for mitigations.

References

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

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