The remote API at /computer/(agent-name)/api showed information about tasks (typically builds) currently running on that agent. This included information about tasks that the current user otherwise has no access to, e.g. due to lack of Job/Read permission. External References: https://jenkins.io/security/advisory/2017-10-11/
Created jenkins tracking bugs for this issue: Affects: openshift-1 [bug 1501970]
Created jenkins tracking bugs for this issue: Affects: fedora-all [bug 1558842]
Openshift is now using Jenkins 2.89.2. Marking Enterprise and Online as not affected.