Gitea 1.12.x and 1.13.x before 1.13.4 allows XSS via certain issue data in some situations.
https://github.com/OhMyCrab/cve
https://github.com/advisories/GHSA-g95p-88p4-76cm
https://github.com/go-gitea/gitea/pull/14898
https://github.com/PandatiX/CVE-2021-28378