The PlonePAS product 3.x before 3.9 and 3.2.x before 3.2.2, a product for Plone, does not properly handle the login form, which allows remote authenticated users to acquire the identity of an arbitrary user via unspecified vectors.
https://exchange.xforce.ibmcloud.com/vulnerabilities/50061
http://www.securityfocus.com/bid/34664
http://secunia.com/advisories/34840
http://plone.org/products/plone/security/advisories/cve-2009-0662