Drupal CAS Server <2.1.4: Open Redirect via URL Redirection
CVE-2026-87937 Published on October 22, 2026

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

NVD

Weakness Type

What is an Open Redirect Vulnerability?

A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. An http parameter may contain a URL value and could cause the web application to redirect the request to the specified URL. By modifying the URL value to a malicious site, an attacker may successfully launch a phishing scam and steal user credentials. Because the server name in the modified link is identical to the original site, phishing attempts have a more trustworthy appearance.

CVE-2026-87937 has been classified to as an Open Redirect vulnerability or weakness.


Affected Versions

Drupal Central Authentication System (CAS) Server: