Cross site scripting

In Jenkins 2.340 through 2.355 both inclusive the tooltip of the build button in list views supports HTML without escaping the job display name, resulting in a cross-site scripting XSS vulnerability exploitable by attackers with Job/Configure permission...

Default credentials

In Jenkins 2.355 and earlier, LTS 2.332.3 and earlier, an observable timing discrepancy on the login form allows distinguishing between login attempts with an invalid username, and login attempts with a valid username and wrong password, when using the Jenkins user database security realm...