Permissions, Privileges, and Access Controls
Microsoft Windows XP with Fast User Switching (FUS) enabled does not remove the "show processes from all users" privilege when the user is removed from the administrator group, which allows that user to view processes of other users.
CWE-264 - Permissions Privileges and Access Controls
CWE 264 (permissions, privileges, and access controls) is not a weakness in and of itself, rather it is a category of weaknesses related to the management of permissions, privileges, and other security features used to perform access control. If not addressed, the weaknesses in this category allow attackers to gain privileges for an unintended sphere of control, access sensitive information, and execute arbitrary commands.