Plone · Plone Cms · CVE-2016-7137
**Name of the Vulnerable Software and Affected Versions**
Plone CMS versions 3.3.x through 3.3.6
Plone CMS versions 4.x through 4.3.11
Plone CMS versions 5.x through 5.0.6
**Description**
The issue allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks. This can be achieved via a URL in the `referer` parameter to specific endpoints, such as `%2b%2bgroupdashboard%2b%2bplone.dashboard1%2bgroup/%2b/portlets.Actions` or `folder/%2b%2bcontextportlets%2b%2bplone.footerportlets/%2b /portlets.Actions`, or the `came from` parameter to the `/login form` endpoint.
**Recommendations**
For Plone CMS versions 3.3.x through 3.3.6, update to a version outside of this range to mitigate the risk.
For Plone CMS versions 4.x through 4.3.11, update to a version outside of this range to mitigate the risk.
For Plone CMS versions 5.x through 5.0.6, update to a version outside of this range to mitigate the risk.
As a temporary workaround, consider restricting access to the vulnerable endpoints, such as `%2b%2bgroupdashboard%2b%2bplone.dashboard1%2bgroup/%2b/portlets.Actions` and `folder/%2b%2bcontextportlets%2b%2bplone.footerportlets/%2b /portlets.Actions`, and avoid using the `came from` parameter in the `/login form` endpoint until a patch is available.