In JetBrains TeamCity before 2020.1, users are able to assign more permissions than they have.
In JetBrains Hub before 2020.1.12629, an authenticated user can delete 2FA settings of any other user.
A user without the required permissions could gain access to some JetBrains TeamCity settings. The issue was fixed in TeamCity 2018.2.2.
In JetBrains TeamCity before 2019.2.1, a user without appropriate permissions was able to import settings from the settings.kts file.
In JetBrains YouTrack before 2021.4.31698, a custom logo could be set by a user who has read-only permissions.
In JetBrains YouTrack before 2020.2.6881, a user without permission is able to create an article draft.
In JetBrains YouTrack before 2020.1.659, DB export was accessible to read-only administrators.