CVE-2024-51701: MG Post Contributors XSS Vulnerability

CVE-2024-51701 Overview

CVE-2024-51701 is a reflected cross-site scripting (XSS) vulnerability in the MG Post Contributors WordPress plugin developed by Mahesh Waghmare. The flaw stems from improper neutralization of user-supplied input during web page generation [CWE-79]. Affected versions include MG Post Contributors 1.3 and all prior releases. An attacker can craft a malicious URL that, when clicked by an authenticated or unauthenticated user, executes arbitrary JavaScript in the victim's browser session. Exploitation requires user interaction but no privileges, and the attack crosses security boundaries because the injected script runs in the trusted WordPress origin.

Critical Impact
Successful exploitation enables session hijacking, credential theft, and unauthorized actions performed in the context of the targeted WordPress user.

Affected Products

Mahesh Waghmare MG Post Contributors plugin for WordPress
All versions from initial release through 1.3
WordPress sites with the mg-post-contributors plugin installed and active

Discovery Timeline

2024-11-09 - CVE-2024-51701 published to NVD
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2024-51701

Vulnerability Analysis

The MG Post Contributors plugin fails to sanitize and encode user-controlled input before reflecting it back in HTTP responses. When a victim follows a crafted link, the plugin renders the attacker-supplied payload directly inside the response HTML. The browser then parses the payload as executable JavaScript within the WordPress site's origin.

Because the scope is changed (the injected script can access cookies and DOM state of the WordPress page), the impact extends beyond the vulnerable component. The vulnerability requires user interaction, which generally means social engineering through phishing links or malicious referrers.

Root Cause

The root cause is missing or insufficient output encoding on request parameters that the plugin echoes into rendered pages. WordPress provides escaping helpers such as esc_html(), esc_attr(), and esc_url(), but the affected code paths in mg-post-contributors through version 1.3 do not apply these functions to attacker-controlled values.

Attack Vector

The attack is network-based and requires no authentication. An attacker constructs a URL containing a JavaScript payload in a vulnerable parameter handled by the plugin. The attacker delivers this URL through phishing email, malicious advertising, or a compromised third-party site. When a victim with a session on the WordPress site clicks the link, the payload executes and can exfiltrate session cookies, perform actions as the victim, or redirect to attacker-controlled infrastructure. Refer to the Patchstack WordPress Vulnerability Analysis for additional technical context.

Detection Methods for CVE-2024-51701

Indicators of Compromise

HTTP request logs containing <script>, javascript:, onerror=, or URL-encoded equivalents (%3Cscript%3E) in query parameters targeting mg-post-contributors endpoints
Unexpected outbound requests from user browsers to unknown domains immediately following access to plugin URLs
Anomalous administrator account activity such as new user creation or plugin installation following a successful phishing interaction

Detection Strategies

Inspect web server access logs for requests to /wp-content/plugins/mg-post-contributors/ paths containing reflected payload patterns
Deploy a Web Application Firewall (WAF) rule set that flags common XSS signatures in GET and POST parameters
Correlate browser-side Content Security Policy (CSP) violation reports with the affected plugin pages

Monitoring Recommendations

Enable detailed HTTP request logging on the WordPress host and forward logs to a centralized analytics platform
Monitor WordPress audit logs for changes to user roles, options, and content occurring shortly after suspicious URL access
Track outbound DNS queries from administrator workstations for anomalous domains associated with credential exfiltration

How to Mitigate CVE-2024-51701

Immediate Actions Required

Identify all WordPress sites running the mg-post-contributors plugin and inventory their versions
Deactivate and remove the plugin if a fixed version is not yet available from the vendor
Force password resets and invalidate active sessions for all administrative users if exploitation is suspected

Patch Information

At the time of publication, the advisory lists affected versions through 1.3 with no fixed version identified. Site administrators should consult the Patchstack WordPress Vulnerability Analysis and the official WordPress plugin repository for updated release information.

Workarounds

Disable the MG Post Contributors plugin until a vendor patch is released
Deploy a WAF with managed rules that block reflected XSS payloads targeting WordPress plugins
Implement a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
Train administrators and editors to avoid clicking unsolicited links that point to their own WordPress site

bash

# Configuration example: disable the vulnerable plugin via WP-CLI
wp plugin deactivate mg-post-contributors
wp plugin delete mg-post-contributors

# Example restrictive Content Security Policy header (Nginx)
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'" always;