Some vulnerabilities have been reported in MyBB, where one has an unknown impact and others can be exploited by malicious people to conduct cross-site scripting and cross-site request forgery attacks.
1) An error related to an unparsed avatar in the buddy list exists. No further information is currently available.
2) Input passed via the username is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.
3) The application allows users to perform certain actions via HTTP requests without performing proper validity checks to verify the requests. This can be exploited to e.g. change the language setting when a logged-in user visits a specially crafted web page.
The vulnerabilities are reported in versions prior to 1.6.5.
Solution: Update to version 1.6.5.
Provided and/or discovered by: 3) Nathan Malcolm within a MyBB bug report
The vendor credits:
2) Will G
Original Advisory: MyBB:
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Subject: MyBB Multiple Vulnerabilities
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