Jenkins Timestamper Plugin 1.11.1 and earlier does not sanitize HTML formatting of its output, resulting in a stored XSS vulnerability exploitable by attackers with Overall/Administer permission.
https://jenkins.io/security/advisory/2020-03-09/#SECURITY-1784
http://www.openwall.com/lists/oss-security/2020/03/09/1
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-2137