Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not escape button labels in the Jenkins UI, resulting in a cross-site scripting (XSS) vulnerability exploitable by attackers with the ability to control button labels.
https://github.com/advisories/GHSA-wv63-gwr9-5c55
https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2035