Improper Access Control
The Drupal core 9.0.0-alpha1 through 9.3.18 and 9.4.0-alpha1 through 9.4.2 under certain circumstances, evaluates form element access incorrectly. This may lead to a user being able to alter data they should not have access to.
CWE-284 - Improper Access Control
Listed 5th in the 'OWASP Top Ten', improper (or broken) access control attacks are a fundamental type of vulnerability. This includes a broad range of design flaws that enable users to act outside of their intended permissions. They can use these privileges to gain access to restricted files and functionality such as accessing restricted information, falsifying records, destroying data, or executing commands.