View online: https://www.drupal.org/sa-core-2024-004

Project: Drupal core [1] Date: 2024-November-20 Security risk: *Moderately critical* 10 ∕ 25 AC:Basic/A:User/CI:None/II:Some/E:Theoretical/TD:Default [2] Vulnerability: Access bypass

Affected versions: >= 8.0.0 < 10.2.11 || >= 10.3.0 < 10.3.9 || >= 11.0.0 < 11.0.8 Description:  Drupal's uniqueness checking for certain user fields is inconsistent depending on the database engine and its collation.

As a result, a user may be able to register with the same email address as another user.

This may lead to data integrity issues.

Solution:  Install the latest version:

* If you are using Drupal 10.2, update to Drupal 10.2.11. [3] * If you are using Drupal 10.3, update to Drupal 10.3.9. [4] * If you are using Drupal 11.0, update to Drupal 11.0.8. [5] * Drupal 7 is not affected.

All versions of Drupal 10 prior to 10.2 are end-of-life and do not receive security coverage. (Drupal 8 [6] and Drupal 9 [7] have both reached end-of-life.)

Updating Drupal will not solve potential issues with existing accounts affected by this bug. See Fixing emails that vary only by case [8] for additional guidance.

Reported By:  * Wayne Eaker [9]

Fixed By:  * Wayne Eaker [10] * cilefen [11] of the Drupal Security Team * Kristiaan Van den Eynde [12] * Drew Webber [13] of the Drupal Security Team * Lee Rowlands [14] of the Drupal Security Team

Coordinated By:  * Juraj Nemec [15] of the Drupal Security Team * Benji Fisher [16] of the Drupal Security Team * xjm [17] 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/10.2.11 [4] https://www.drupal.org/project/drupal/releases/10.3.9 [5] https://www.drupal.org/project/drupal/releases/11.0.8 [6] https://www.drupal.org/psa-2021-06-29 [7] https://www.drupal.org/psa-2023-11-01 [8] https://www.drupal.org/node/3486109 [9] https://www.drupal.org/user/326925 [10] https://www.drupal.org/user/326925 [11] https://www.drupal.org/user/1850070 [12] https://www.drupal.org/user/1345130 [13] https://www.drupal.org/user/255969 [14] https://www.drupal.org/user/395439 [15] https://www.drupal.org/user/272316 [16] https://www.drupal.org/user/683300 [17] https://www.drupal.org/u/xjm