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Pro Chat Rooms contains a flaw that allows a remote Cross-Site Request Forgery (CSRF / XSRF) attack. The flaw exists because the application does not require multiple steps and/or confirmation for sensitive transactions for the 'sendData.php' script using the 'avatar' parameter. By using a crafted URL (e.g. a crafted GET request inside an "img" tag), an attacker may trick the victim into clicking on the image to take advantage of the trust relationship between the authenticated victim and the application. Such an attack could trick the victim into executing arbitrary commands in the context of their session with the application, without further prompting or verification.
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