URL Redirection to Untrusted Site ('Open Redirect')
An open redirect on the login form (and possibly other places) in Plone 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.
CWE-601 - Open Redirect
An open redirect attack employs a URL parameter, HTML refresh tags, or a DOM based location change to exploit the trust of a vulnerable domain to direct the users to a malicious website. The attack could lead to higher severity vulnerabilities such as unauthorized access control, account takeover, XSS, and more.