View online: https://www.drupal.org/sa-core-2021-002 Project: Drupal core [1] Date: 2021-April-21 Security risk: *Critical* 15∕25 AC:Basic/A:None/CI:Some/II:Some/E:Theoretical/TD:Default [2] Vulnerability: Cross-site scripting Description:  Drupal core's sanitization API fails to properly filter cross-site scripting under certain circumstances. Not all sites and users are affected, but configuration changes to prevent the exploit might be impractical and will vary between sites. Therefore, we recommend all sites update to this release as soon as possible. Solution:  Install the latest version: * If you are using Drupal 9.1, update to Drupal 9.1.7 [3]. * If you are using Drupal 9.0, update to Drupal 9.0.12 [4]. * If you are using Drupal 8.9, update to Drupal 8.9.14 [5]. * If you are using Drupal 7, update to Drupal 7.80 [6]. Versions of Drupal 8 prior to 8.9.x are end-of-life and do not receive security coverage. Reported By:  * Jasper Mattsson [7] Fixed By:  * Alex Pott [8] of the Drupal Security Team * Jasper Mattsson [9] * Michael Hess [10] of the Drupal Security Team * Wim Leers [11] * Heine [12] of the Drupal Security Team * Peter Wolanin [13] of the Drupal Security Team * Jess (xjm) [14] of the Drupal Security Team * Samuel Mortenson [15] of the Drupal Security Team * nwellnhof [16] * Alex Bronstein [17] of the Drupal Security Team * Lee Rowlands [18] of the Drupal Security Team * Adam G-H [19] * Drew Webber [20] of the Drupal Security Team [1] https://www.drupal.org/project/drupal [2] https://www.drupal.org/security-team/risk-levels [3] https://www.drupal.org/project/drupal/releases/9.1.7 [4] https://www.drupal.org/project/drupal/releases/9.0.12 [5] https://www.drupal.org/project/drupal/releases/8.9.14 [6] https://www.drupal.org/project/drupal/releases/7.80 [7] https://www.drupal.org/user/521118 [8] https://www.drupal.org/user/157725 [9] https://www.drupal.org/user/521118 [10] https://www.drupal.org/user/102818 [11] https://www.drupal.org/user/99777 [12] https://www.drupal.org/user/17943 [13] https://www.drupal.org/user/49851 [14] https://www.drupal.org/user/65776 [15] https://www.drupal.org/user/2582268 [16] https://www.drupal.org/user/3407764 [17] https://www.drupal.org/user/78040 [18] https://www.drupal.org/user/395439 [19] https://www.drupal.org/user/205645 [20] https://www.drupal.org/user/255969