The vulnerability carries a CVSS score of 9.8 out of 10 as it requires no authentication or user interaction, making internet-exposed TeamCity servers particularly attractive targets. Classified under CWE-502 (deserialization of unstructured data), the flaw can be used to send specially crafted data through the affected agent polling protocol to trigger remote code execution (RCE).
“Depending on the privileges granted to the TeamCity server process, a successful attack could expose TeamCity data, configurations, and stored credentials, modify server state, and potentially compromise the integrity of build artifacts and downstream CI/CD pipelines,” the company added.
The issue was privately reported on July 10 by security researcher Antoni Tremblay through JetBrains’ coordinated disclosure process.
