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.
Install the latest version:
If you are using Drupal 10.2, update to Drupal 10.2.11.
If you are using Drupal 10.3, update to Drupal 10.3.9.
If you are using Drupal 11.0, update to Drupal 11.0.8.
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 and Drupal 9 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 for additional guidance.
cilefen of the Drupal Security Team
Kristiaan Van den Eynde
Drew Webber of the Drupal Security Team
Lee Rowlands of the Drupal Security Team
Benji Fisher of the Drupal Security Team
xjm of the Drupal Security Team
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