Jenkins 2.274 and earlier, LTS 2.263.1 and earlier allows reading arbitrary files using the file browser for workspaces and archived artifacts by following symlinks.
This issue has been addressed in the following products: Red Hat OpenShift Container Platform 4.6 Via RHSA-2021:0423 https://access.redhat.com/errata/RHSA-2021:0423
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2021-21602
This issue has been addressed in the following products: Red Hat OpenShift Container Platform 4.5 Via RHSA-2021:0429 https://access.redhat.com/errata/RHSA-2021:0429