NBBN has discovered some vulnerabilities in MyBB, which can be exploited can be exploited by malicious people to disclose sensitive information.
The problem is that the "my_post_key" token is included in the "Referer" HTTP header when sending certain requests for e.g. images referencing external web sites (e.g. when performing various moderation actions, like splitting and merging a thread or deleting posts). This can be exploited to disclose a user's secret token by tricking the user into performing an affected operation.
Successful exploitation may open up for various cross-site request forgery and cross-site scripting attacks.
The vulnerability is confirmed in version 1.4.3. Other versions may also be affected.
Solution: Update to version 1.4.4.
Provided and/or discovered by: NBBN
Original Advisory: http://packetstorm.linuxsecurity.com/0811-exploits/mybb-disclose.txt
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