JetBrains PyCharm before 2019.2 was allocating a buffer of unknown size for one of the connection processes. In a very specific situation, it could lead to a remote invocation of an OOM error message because of Uncontrolled Memory Allocation.
Server metadata could be exposed because one of the error messages reflected the whole response back to the client in JetBrains TeamCity versions before 2018.2.5 and UpSource versions before 2018.2 build 1293.
An issue was discovered in JetBrains TeamCity 2018.2.4. A TeamCity Project administrator could get access to potentially confidential server-level data. The issue was fixed in TeamCity 2018.2.5 and 2019.1.
JetBrains YouTrack versions before 2019.1.52545 allowed unbounded URL whitelisting because of Inclusion of Functionality from an Untrusted Control Sphere.
An issue was discovered in JetBrains TeamCity 2018.2.4. It had no SSL certificate validation for some external https connections. This was fixed in TeamCity 2019.1.
In JetBrains Hub versions earlier than 2018.4.11436, there was no option to force a user to change the password and no password expiration policy was implemented.