JetBrains TeamCity 8 and 9 before 9.0.2 allows bypass of account-creation restrictions via a crafted request because the required request data can be deduced by reading HTML and JavaScript files that are returned to the web browser after an initial unauthenticated request.
In JetBrains TeamCity before 2023.05 improper permission checks allowed users without appropriate permissions to edit Build Configuration settings via REST API