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TI-2026-79084 Aliases CVE-2026-87937GHSA-9m9j-x6cp-vc3f

Open redirect in Drupal Central Authentication System (CAS) Server

Priority LOW 35CWE-601Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-601.

Summary

Drupal Central Authentication System (CAS) Server versions from 0.0.0 before 2.0.4 and from 2.1.0 before 2.1.3 are affected. A URL redirection flaw (CWE-601) lets the server send users to an untrusted site. A remote attacker without privileges or user interaction can abuse the redirect to fake the source of data, with limited confidentiality and integrity impact.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00284 21st percentileScored 2026-11-07
Fix Fixed Central Authentication System (CAS) Server (Drupal): 2.0.4, 2.1.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
DrupalCentral Authentication System (CAS) Server0.0.0 to before 2.0.4; 2.1.0 to before 2.1.32.0.4, 2.1.3Patch availableCNA
  • Central Authentication System (CAS) Server VendorDrupal Affected 0.0.0 to before 2.0.4; 2.1.0 to before 2.1.3 Fixed in 2.0.4, 2.1.3 Patch available CNA

Remediation

Upgrade Drupal Central Authentication System (CAS) Server to version 2.0.4 or 2.1.3, matching the installed release. See Drupal security advisory SA-CONTRIB-2026-135.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Central Authentication System (CAS) Server (Drupal) Fixed in 2.0.4, 2.1.3

Timeline

  1. 2026-10-22 Threatist record created from CVE-2026-87937
  2. 2026-10-22 Alias added: GHSA-9m9j-x6cp-vc3f
  3. 2026-10-22 CVSS score added · CISA ADP
  4. 2026-10-22 CISA SSVC decision points changed

References

Other 1

  • TI-2026-07979 Drupal core - Highly critical - SQL injection - SA-CORE-2026-004 KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-05494 Drupal core - Highly critical - Remote Code Execution - SA-CORE-2018-004 KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-05493 Improper input validation in Drupal before 7.58, 8.x before 8.3.9, 8.4.x before 8.4.6… KEVCVSS 3.1CRITICAL 9.8
  • TI-2020-10731 Unrestricted file upload in Drupal Core KEVCVSS 3.1HIGH 8.8
  • TI-2019-04505 Drupal core - Highly critical - Remote Code Execution KEVCVSS 3.1HIGH 8.1
  • TI-2020-17477 Archive_Tar through 1.4.10 has :// filename sanitization only to address phar attacks… KEVCVSS 3.1HIGH 7.8
See all 941 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences