DRUPAL-CONTRIB-2026-135

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    DRUPAL-CONTRIB-2026-135

    Published: 9 Sept 2026Last Modified: 9 Sept 2026

    Summary:

    Details: This module enables you to turn a Drupal install into the Central Authentication System (CAS) Server. It makes your database the primary location for other systems to use for authentication in a SSO environment. The module doesn't sufficiently check the service URL used to redirect the user during logout, leading to an open redirect. This vulnerability is mitigated by the fact that an attacker must convince a user to click a specially crafted link. The vulnerability cannot be exploited without user interaction and does not allow an attacker to directly compromise the CAS server or bypass authentication.

    References: https://www.drupal.org/sa-contrib-2026-135

    Affected packages

    Package

    Name: drupal/cas_server

    Purl: pkg:composer/drupal/cas_server?repository_url=https:%2F%2Fpackages.drupal.org%2F8

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.0.4

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    DRUPAL-CONTRIB-2026-135 | CVE-DB