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source: http://www.securityfocus.com/bid/23616/info Phorum is prone to multiple input-validation vulnerabilities, including an unauthorized-access issue, privilege-escalation issue, multiple SQL-injection issues, and cross-site scripting issues, because the application fails to sufficiently sanitize user-supplied input. Exploiting these issues could allow an attacker to steal cookie-based authentication credentials, compromise the application, access or modify sensitive data, or exploit latent vulnerabilities in the underlying database implementation. Phorum 5.1.20 is affected; prior versions may also be vulnerable. http://localhost/phorum.5.1.20/admin.php?module=modsettings&mod=smileys& edit=1&smiley_id="><script>alert(123);</script>