The following flaw was found in Jenkins:
The CLI command overview and help pages in Jenkins were accessible without Overall/Read permission, resulting in disclosure of the names of configured slaves (and contents of other sidepanel widgets, if present) to unauthorized users.
While the amount of information disclosed is very limited, it is trivial to exploit this flaw.
External References:
https://wiki.jenkins-ci.org/display/SECURITY/Jenkins+Security+Advisory+2015-11-11