CVE-2024-10388: WordPress GDPR Plugin XSS Vulnerability

CVE-2024-10388 Overview

CVE-2024-10388 is a stored Cross-Site Scripting (XSS) vulnerability in the WeLaunch WordPress GDPR plugin. The flaw affects all versions up to and including 2.0.2. Unauthenticated attackers can inject arbitrary JavaScript through the gdpr_firstname and gdpr_lastname parameters. The injected scripts execute whenever a user visits an affected page. The root cause is insufficient input sanitization and output escaping [CWE-79].

Critical Impact
Unauthenticated attackers can inject persistent JavaScript into WordPress pages, enabling session theft, admin account takeover, and drive-by redirects when authenticated users view the poisoned content.

Affected Products

WeLaunch WordPress GDPR plugin versions up to and including 2.0.2
WordPress sites using the affected plugin as a GDPR compliance component
Any front-end page rendering data captured through gdpr_firstname or gdpr_lastname

Discovery Timeline

2024-11-19 - CVE-2024-10388 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in the NVD database

Technical Details for CVE-2024-10388

Vulnerability Analysis

The WordPress GDPR plugin exposes request handlers that accept user-supplied first name and last name values through the gdpr_firstname and gdpr_lastname parameters. The plugin stores these values and later renders them into HTML output without sufficient sanitization on input or escaping on output. Because the endpoints do not require authentication, remote attackers can submit crafted payloads without any prior account access. Once persisted, the malicious payload executes in the browser of every visitor who loads the affected page, including logged-in administrators.

Stored XSS in a GDPR-labeled component is particularly effective because the plugin surfaces user data across consent workflows and administrative screens. Successful exploitation can lead to session cookie theft, forced administrative actions through cross-site request forgery chaining, and redirection to attacker-controlled infrastructure hosting further payloads.

Root Cause

The underlying defect is a failure to apply WordPress sanitization primitives such as sanitize_text_field() on the gdpr_firstname and gdpr_lastname inputs, combined with missing output escaping through esc_html() or esc_attr() when rendering the stored values. This dual failure allows raw HTML and script tags to survive from HTTP request to rendered DOM.

Attack Vector

The attack is network-based and requires user interaction to trigger the payload in a victim's browser session. An unauthenticated attacker submits a crafted request containing a JavaScript payload in the gdpr_firstname or gdpr_lastname parameter. The plugin stores the payload, and any subsequent visitor loading the affected page executes the injected script under the origin of the vulnerable WordPress site. The vulnerability causes a scope change, meaning executed script can affect resources beyond the vulnerable component itself, including authenticated admin sessions.

No verified proof-of-concept code is publicly documented. Refer to the Wordfence Vulnerability Report #bf707d9b for additional technical context.

Detection Methods for CVE-2024-10388

Indicators of Compromise

HTTP POST requests to WordPress endpoints containing gdpr_firstname or gdpr_lastname parameters with <script>, onerror=, onload=, or javascript: substrings
Unexpected <script> tags or event-handler attributes rendered inside GDPR consent or profile forms on the site
Outbound requests from visitor browsers to unfamiliar domains after loading pages that display GDPR plugin data
Administrator session anomalies such as unexpected privilege changes or new admin accounts created shortly after page views

Detection Strategies

Deploy web application firewall rules that inspect the gdpr_firstname and gdpr_lastname fields for HTML control characters and known XSS payload patterns
Scan the WordPress database, particularly wp_postmeta and plugin-specific tables, for stored values containing script tags or JavaScript URI schemes
Monitor Content Security Policy violation reports for inline script executions on pages that render GDPR plugin content

Monitoring Recommendations

Enable verbose access logging on WordPress and retain request bodies for parameters associated with GDPR plugin endpoints
Alert on any administrative action, such as user creation or plugin installation, that follows a page view containing suspicious GDPR field data
Track plugin version inventory across all WordPress installations and flag any host still running WeLaunch WordPress GDPR at or below version 2.0.2

How to Mitigate CVE-2024-10388

Immediate Actions Required

Update the WeLaunch WordPress GDPR plugin to a version newer than 2.0.2 as soon as the vendor publishes a fixed release
Audit the WordPress database for stored payloads in gdpr_firstname and gdpr_lastname fields and remove any records containing HTML or script content
Rotate credentials and invalidate active sessions for any administrator who accessed pages rendering GDPR plugin data during the exposure window

Patch Information

Consult the WeLaunch WordPress GDPR Changelog for the fixed release. Cross-reference the fixed version with the Wordfence Vulnerability Report #bf707d9b before deploying to production.

Workarounds

Deactivate the WeLaunch WordPress GDPR plugin until a patched version is installed if the plugin is not business-critical
Deploy a web application firewall rule that rejects requests containing <, >, or javascript: sequences in the gdpr_firstname and gdpr_lastname parameters
Enforce a strict Content Security Policy that disallows inline script execution to blunt the impact of any residual stored payloads

bash

# Configuration example
# Example ModSecurity rule blocking XSS payloads in GDPR plugin parameters
SecRule ARGS:gdpr_firstname|ARGS:gdpr_lastname "@rx (?i)(<script|onerror=|onload=|javascript:)" \
    "id:1024010388,phase:2,deny,status:403,log,msg:'CVE-2024-10388 XSS attempt in WordPress GDPR plugin'"