CVE-2024-56210: Userpro Plugin Reflected XSS Vulnerability

CVE-2024-56210 Overview

CVE-2024-56210 is a reflected Cross-Site Scripting (XSS) vulnerability in the DeluxeThemes UserPro plugin for WordPress. The flaw stems from improper neutralization of user-supplied input during web page generation [CWE-79]. Attackers can craft a malicious URL that, when clicked by an authenticated or unauthenticated user, executes arbitrary JavaScript in the victim's browser session.

The vulnerability affects UserPro versions up to and including 5.1.9. Successful exploitation can lead to session hijacking, credential theft, redirection to attacker-controlled sites, or actions performed on behalf of the victim within the WordPress site.

Critical Impact
Attackers can execute arbitrary JavaScript in a victim's browser via a crafted link, enabling session theft and account compromise on WordPress sites running UserPro 5.1.9 or earlier.

Affected Products

DeluxeThemes UserPro WordPress plugin versions through 5.1.9
WordPress sites with the UserPro plugin installed and active
Any user session interacting with the vulnerable plugin endpoints

Discovery Timeline

2024-12-31 - CVE-2024-56210 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-56210

Vulnerability Analysis

The UserPro plugin extends WordPress with user profile, registration, and community features. The vulnerability resides in code paths that reflect user-controlled input back into rendered HTML without proper output encoding or sanitization. When a victim visits a specially crafted URL, the injected payload is reflected in the response and executed by the browser within the site's origin.

Because the CVSS vector indicates a scope change with low impact across confidentiality, integrity, and availability, the executed script can affect resources beyond the vulnerable component. User interaction is required, meaning the attack typically relies on phishing or social engineering to deliver the malicious link.

Root Cause

The root cause is missing or insufficient input sanitization and output encoding in one or more request handlers within UserPro. Parameters supplied through HTTP requests are echoed back into HTML responses without being passed through WordPress sanitization functions such as esc_html(), esc_attr(), or wp_kses(). This allows raw <script> tags and event handler attributes to be injected.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker crafts a URL containing a JavaScript payload as a query parameter targeting a vulnerable UserPro endpoint. The attacker then distributes the link through email, social media, or compromised sites. When a victim clicks the link, the payload executes in the context of the WordPress site, with access to cookies, the Document Object Model (DOM), and any session tokens not protected by HttpOnly flags.

No verified public proof-of-concept code is available. Refer to the Patchstack advisory for further technical details.

Detection Methods for CVE-2024-56210

Indicators of Compromise

HTTP requests to UserPro plugin endpoints containing <script>, javascript:, onerror=, onload=, or URL-encoded equivalents in query parameters
Referrer headers pointing to external phishing domains followed by requests to UserPro URLs
Unexpected outbound requests from administrator browsers to unknown domains shortly after visiting site links
Web server access logs showing repeated probing of UserPro parameters with encoded payloads

Detection Strategies

Inspect Web Application Firewall (WAF) and reverse proxy logs for XSS signatures targeting UserPro request parameters
Correlate authenticated administrator sessions with anomalous JavaScript-bearing URLs in browser history or proxy logs
Monitor WordPress audit logs for unexpected account changes that follow user clicks on external links

Monitoring Recommendations

Enable verbose logging on the WordPress site and forward access logs to a centralized log analytics platform
Alert on HTTP requests containing common XSS tokens directed at /wp-content/plugins/userpro/ paths
Track plugin version inventory across WordPress estates to identify hosts still running UserPro 5.1.9 or earlier

How to Mitigate CVE-2024-56210

Immediate Actions Required

Update the UserPro plugin to a version released after 5.1.9 that addresses CVE-2024-56210
If no fixed version is available, deactivate and remove the UserPro plugin until a patch is released
Review administrator and editor accounts for unauthorized changes and force password resets on privileged accounts
Invalidate active sessions and rotate WordPress authentication cookies and secret keys in wp-config.php

Patch Information

Consult the Patchstack advisory for UserPro for the latest fixed version information and vendor remediation guidance. Apply the update through the WordPress plugin manager or via WP-CLI once the patched release is confirmed.

Workarounds

Deploy a WAF rule that blocks requests containing XSS payloads such as <script, javascript:, and common event handlers targeting UserPro endpoints
Set a strict Content Security Policy (CSP) header that disallows inline scripts and restricts script sources to trusted origins
Ensure session cookies use HttpOnly, Secure, and SameSite=Lax or stricter attributes to limit script-based theft
Restrict administrator access to known IP ranges and require multi-factor authentication for all privileged WordPress accounts

bash

# Example WP-CLI commands to inventory and update the UserPro plugin
wp plugin list --name=userpro --fields=name,status,version
wp plugin update userpro
wp plugin deactivate userpro   # if no patched version is available yet