In JetBrains YouTrack versions before 2020.3.4313, 2020.2.11008, 2020.1.11011, 2019.1.65514, 2019.2.65515, and 2019.3.65516, an attacker can retrieve an issue description without appropriate access.
In JetBrains Kotlin from 1.4-M1 to 1.4-RC (as Kotlin 1.3.7x is not affected by the issue. Fixed version is 1.4.0) there is a script-cache privilege escalation vulnerability due to kotlin-main-kts cached scripts in the system temp directory, which is shared by all users by default.