Jenkins Dashboard View Plugin 2.15 and earlier does not escape URLs referenced in Image Dashboard Portlets, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with View/Configure permission.
https://github.com/advisories/GHSA-jwhm-9cjm-4493
https://www.jenkins.io/security/advisory/2021-05-11/#SECURITY-2233