Bypassing CAPTCHA in reg.php of Allen Disk 1.6 via empty $_POST['captcha']

CVE-2017-9090 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:P/A:N

reg.php in Allen Disk 1.6 doesn't check if isset($_SESSION['captcha']['code'])==1, which makes it possible to bypass the CAPTCHA via an empty $_POST['captcha'].

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