[Security-news] Central Authentication System (CAS) Server - Less critical - XML Element Injection - SA-CONTRIB-2026-007

[security-news at drupal.org]

View online: https://www.drupal.org/sa-contrib-2026-007

Project: Central Authentication System (CAS) Server [1]
Date: 2026-January-28
Security risk: *Less critical* 6 ∕ 25
AC:Complex/A:User/CI:None/II:None/E:Theoretical/TD:Default [2]
Vulnerability: XML Element Injection

Affected versions: <2.0.3 || >=2.1.0 <2.1.2
CVE IDs: CVE-2026-1554
Description: 
This module enables you to turn a Drupal install into the Central
Authentication System (CAS). It makes your database the primary location for
other systems to use for authentication in a SSO environment.

The module doesn't sufficiently sanitize user-supplied field values
configured to be included as attributes in a CAS server response.

This vulnerability is mitigated by the fact that an attacker must be
authenticated, have the ability to enter XML into a user entity field, and
that field be configured as a CAS Attribute source leading to an XML Element
Injection vulnerability.

Solution: 
Install the latest version:

  * If you use the CAS Server module for Drupal >=9.1.x or 10.x, upgrade to
    CAS Server 2.0.3 [3]
  * If you use the CAS Server module for Drupal >=10.3.x or 11.x, upgrade to
    CAS Server 2.1.2 [4]

Reported By: 
  * Gaël Gosset (gaëlg) [5]

Fixed By: 
  * Ted Cooper (elc) [6]
  * Gaël Gosset (gaëlg) [7]
  * Jaap Jansma (jaapjansma) [8]

Coordinated By: 
  * Greg Knaddison (greggles) [9] of the Drupal Security Team
  * Juraj Nemec (poker10) [10] of the Drupal Security Team

Security
issue: https://git.drupalcode.org/security/30-cas_server-security/-/issues/1
[11]
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Contribution record [12]

[1] https://www.drupal.org/project/cas_server
[2] https://www.drupal.org/security-team/risk-levels
[3] https://www.drupal.org/project/cas_server/releases/2.0.3
[4] https://www.drupal.org/project/cas_server/releases/2.1.2
[5] https://www.drupal.org/u/ga%C3%ABlg
[6] https://www.drupal.org/u/elc
[7] https://www.drupal.org/u/ga%C3%ABlg
[8] https://www.drupal.org/u/jaapjansma
[9] https://www.drupal.org/u/greggles
[10] https://www.drupal.org/u/poker10
[11] https://git.drupalcode.org/security/30-cas_server-security/-/issues/1
[12]  
https://new.drupal.org/contribution-record?source_link=https%3A//www.drupal.org/node/3567524