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.
{ "constraint": ">= 8.0.0 < 10.2.11" }
{ "constraint": ">= 10.3.0 < 10.3.9" }
{ "constraint": ">= 11.0.0 < 11.0.8" }
">= 8.0.0 < 10.2.11 || >= 10.3.0 < 10.3.9 || >= 11.0.0 < 11.0.8"
"https://github.com/DrupalSecurityTeam/drupal-advisory-database/blob/main/advisories/core/DRUPAL-CORE-2024-004.json"