Escape user-supplied 'asdf' parameter in popuphelp.php to prevent reflected XSS #92
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Reflected Cross-Site Scripting (XSS) allows an attacker to execute arbitrary JavaScript in a user's browser, potentially leading to session hijacking or defacement. In popuphelp.php, lines 22-23 directly echo the value of the 'asdf' GET parameter, which causes unsanitized user-supplied input to be reflected in the page's HTML. Because the page is accessible to guests, an attacker can craft a malicious URL to inject arbitrary scripts into the context of the application.