WordPress User IDs and User Names Disclosure

I. Advisory information
Title: WordPress User IDs and User Names Disclosure
Advisory Id: TALSOFT-2011-0526
Advisory URL:
http://www.talsoft.com.ar/index.php/research/security-advisories/wordpress-user-id-and-user-name-disclosure
Date published: 2011-05-26
Vendors contacted: WordPress
Author: Verónica Valeros

II. Vulnerability information
Class: Insecure Direct Object References (CWE-715)
Impact: