Vulnerability from drupal
Published
2026-01-28 17:29
Modified
2026-01-28 17:29
Summary
Details

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.

Credits
Gaël Gosset (gaëlg) www.drupal.org/u/ga%C3%ABlg
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "affected_versions": "\u003c2.0.3 || \u003e=2.1.0 \u003c2.1.2"
      },
      "package": {
        "ecosystem": "Packagist:https://packages.drupal.org/8",
        "name": "drupal/cas_server"
      },
      "ranges": [
        {
          "database_specific": {
            "constraint": "\u003c2.0.3"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.3"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "database_specific": {
            "constraint": "\u003e=2.1.0 \u003c2.1.2"
          },
          "events": [
            {
              "introduced": "2.1.0"
            },
            {
              "fixed": "2.1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "severity": []
    }
  ],
  "aliases": [
    "CVE-2026-1554"
  ],
  "credits": [
    {
      "contact": [
        "https://www.drupal.org/u/ga%C3%ABlg"
      ],
      "name": "Ga\u00ebl Gosset (ga\u00eblg)"
    }
  ],
  "details": "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.\n\nThe module doesn\u0027t sufficiently sanitize user-supplied field values configured to be included as attributes in a CAS server response.\n\nThis 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.",
  "id": "DRUPAL-CONTRIB-2026-007",
  "modified": "2026-01-28T17:29:32.000Z",
  "published": "2026-01-28T17:29:32.000Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://www.drupal.org/sa-contrib-2026-007"
    }
  ],
  "schema_version": "1.7.0"
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.