Improper code rendering while rendering merge requests could be exploited to submit malicious code. This vulnerability affects GitLab CE/EE 9.3 and later through 13.11.6, 13.12.6, and 14.0.2.
https://gitlab.com/gitlab-org/gitlab/-/issues/211976
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22230.json