A stored Reflected Cross-Site Scripting vulnerability in the Jira integration in GitLab version 13.0 up to 14.3.1 allowed an attacker to execute arbitrary javascript code.
https://hackerone.com/reports/1194254
https://gitlab.com/gitlab-org/gitlab/-/issues/334043
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39878.json