An issue was discovered in JetBrains TeamCity 2018.2.4. It had a possible remote code execution issue. This was fixed in TeamCity 2019.1.
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.