An open redirect on the login form (and possibly other places) in Plone 4.0 through 5.2.1 allows an attacker to craft a link to a Plone Site that, when followed, and possibly after login, will redirect to an attacker's site. References: https://plone.org/security/hotfix/20200121/an-open-redirection-on-the-login-form-and-possibly-other-places https://plone.org/security/hotfix/20200121
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-2020-7936