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Want to write PoC's and Exploits?

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TITLE:
MyBB "avatarurl" Script Insertion Vulnerability

SECUNIA ADVISORY ID:
SA21181

VERIFY ADVISORY:
http://secunia.com/advisories/21181/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
MyBB (formerly MyBulletinBoard) 1.x
http://secunia.com/product/4479/

DESCRIPTION:
Aliaksandr Hartsuyeu has discovered a vulnerability in MyBB, which
can be exploited by malicious users to conduct script insertion
attacks.

Input passed to the "avatarurl" form field parameter in usercp.php is
not properly sanitised before being used. This can be exploited to
insert arbitrary HTML and script code, which is executed in a user's
browser session in context of an affected site when the malicious
data is viewed.

The vulnerabilities have been confirmed in version 1.1.6. Other
versions may also be affected.

SOLUTION:
Edit the source code to ensure that input is properly sanitised.

PROVIDED AND/OR DISCOVERED BY:
Aliaksandr Hartsuyeu

ORIGINAL ADVISORY:
http://www.evuln.com/vulns/132/summary.html

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