WordPress KingComposer 2.7.6 Cross Site Scripting

` * Vulnerability: XSS  
* Affected Software:  
[KingComposer](https://wordpress.org/plugins/kingcomposer/)  
* Affected Version: 2.7.6  
* Patched Version: none  
* CVE: not requested  
* Risk: Medium  
* Vendor Contacted: 10/25/2018  
* Vendor Fix: none  
* Public Disclosure: 02/05/2019  
* Credit: Tim Coen  
  
##### CVSS  
  
6.1 Medium  
[CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)  
  
##### Overview  
  
The KingComposer WordPress plugin is vulnerable to reflected XSS as it  
echoes the id parameter without proper encoding.  
  
##### Proof of Concept  
  
  
http://192.168.0.103/wordpress/wp-admin/admin.php?page=kc-mapper&id=<%2Fscript><script>alert(1)<%2Fscript>  
  
##### Timeline  
  
- 10/25/2018 Asked for email address via contact form  
- 10/26/2018 Vendor responds  
- 10/26/2018 sent advisory  
- 11/01/2018 Vendor responds that they have strict testing in place,  
asks if it is certain that the issue exists  
- 11/01/2018 Confirmed that the issue indeed exists  
- 11/01/2018 unclear response from vendor  
- 11/01/2018 asked for clarification & offered to explain issue further  
(no response)  
- 02/05/2019 Disclosure  
  
##### Details & Full Advisory URL  
  
https://security-consulting.icu/blog/2019/02/wordpress-kingcomposer-xss/  
  
--   
PGP Key: https://pgp.mit.edu/pks/lookup?op=get&search=0x204DCBDD29BA0D89  
  
  
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