In JetBrains YouTrack before 2020.5.3123, server-side template injection (SSTI) was possible, which could lead to code execution.
https://blog.jetbrains.com/blog/2021/02/03/jetbrains-security-bulletin-q4-2020/
https://blog.jetbrains.com
Source: Mitre, NVD
Published: 2021-02-03
Updated: 2026-06-17
Base Score: 7.5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P
Severity: High
Base Score: 9.8
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: Critical
EPSS: 0.00016