JetBrains TeamCity 2019.1 and 2019.1.1 allows cross-site scripting (XSS), potentially making it possible to send an arbitrary HTTP request to a TeamCity server under the name of the currently logged-in user.
https://www.softwaresecured.com/jetbrains-teamcity-reflected-xss/
https://twitter.com/JLLeitschuh/status/1169332316612644864?s=20
https://gist.github.com/JLLeitschuh/fe6784391254b58de680bbda78a04a70