MyBB 1.6.12 POST XSS 0day

This is a weird bug I found in MyBB. I fuzzed the input of the search.php file. This was my input given.

alert (bar) () ; // ' " > < prompt \x41 %42 constructor onload

MyBB throws out a SQL error:

SELECT t.tid, t.firstpost
FROM mybb_threads t
WHERE 1=1 AND t.closed NOT LIKE 'moved|%'
AND (  LOWER(t.subject) LIKE '%&lt;foo&gt; &lt;h1&gt; &lt;script&gt; alert (bar) () ; //%'  LOWER(t.subject)
LIKE '%&gt; &lt; prompt \x41 \%42 constructor onload%')

fuzz1
(more…)

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