Medium severity · published Oct 22, 2026
CVE-2026-87937
Central Authentication System (CAS) Server - Moderately critical - Open redirect - SA-CONTRIB-2026-135
New
6.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DR
Drupal · Drupal
0.0.0 before 2.0.4; 2.1.0 before 2.1.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-87937
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-87937
www.drupal.org
https://www.drupal.org/sa-contrib-2026-135
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