REST API endpoints in Jenkins 2.218 and earlier, LTS 2.204.1 and earlier were vulnerable to clickjacking attacks.
Created jenkins tracking bugs for this issue:
Affects: fedora-all [bug 1797069]
"Any security advisory related updates to Jenkins core or the plugins we include in the OpenShift Jenkins master image will only occur in the v3.11 and v4.x branches of this repository."
This bug has been fixed by https://errata.devel.redhat.com/advisory/50532 that brought Jenkins 2.204.2