In JetBrains TeamCity before 2021.2.1, an unauthenticated attacker can cancel running builds via an XML-RPC request to the TeamCity server.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-29233
https://blog.jetbrains.com/blog/2022/02/08/jetbrains-security-bulletin-q4-2021/