Vulnerability · Published Oct 22, 2026 · Assigned by drupal
CVE-2026-87937Central Authentication System (CAS) Server - Moderately critical - Open redirect - SA-CONTRIB-2026-135
Medium 6.5
In plain English
A medium-severity open redirect in Central Authentication System (CAS) Server from Drupal. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 78.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist:https://packages.drupal.org/8 | drupal/cas_server | 2.0.4, 2.1.3 | DRUPAL-CONTRIB-2026-135 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Drupal | Central Authentication System (CAS) Server | 0.0.0 – before 2.0.42.1.0 – before 2.1.3 |
Weakness: CWE-601 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N