Jenkins Badge Plugin 1.9 and earlier does not escape the description and does not check for allowed protocols when creating a badge, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Item/Configure permission.

A persisted cross-site scripting vulnerability exists in Jenkins Badge Plugin 1.4 and earlier in BadgeSummaryAction.java, HtmlBadgeAction.java that allows attackers able to control build badge content to define JavaScript that would be executed in another user's browser when that other user performs some UI actions.