CVE-2013-4200: Plone

Medium severity, CVSS 5.8. EPSS: 2.2% chance of exploitation in the next 30 days.

The isURLInPortal method in the URLTool class in in_portal.py in Plone 2.1 through 4.1, 4.2.x through 4.2.5, and 4.3.x through 4.3.1 treats URLs starting with a space as a relative URL, which allows remote attackers to bypass the allow_external_login_sites filtering property, redirect users to arbitrary web sites, and conduct phishing attacks via a space before a URL in the "next" parameter to acl_users/credentials_cookie_auth/require_login.

Affected products

• Plone Plone: version 2.1 only; version 2.1.1 only; version 2.1.2 only; version 2.1.3 only; version 2.1.4 only; version 3.0 only; …

Published 2014-01-21. Last modified 2026-06-16.