CVE-2024-47374: LiteSpeed Cache Stored XSS Vulnerability

CVE-2024-47374 Overview

CVE-2024-47374 is a Stored Cross-Site Scripting (XSS) vulnerability affecting the LiteSpeed Cache plugin for WordPress. This vulnerability stems from improper neutralization of input during web page generation, allowing attackers to inject and persist malicious scripts that execute in victims' browsers when they view affected pages.

Critical Impact

This Stored XSS vulnerability enables attackers to inject persistent malicious scripts into WordPress sites using the LiteSpeed Cache plugin, potentially compromising administrator sessions, stealing credentials, and facilitating further attacks on site visitors.

Affected Products

• LiteSpeed Cache plugin for WordPress versions through 6.5.0.2
• WordPress sites utilizing the LiteSpeed Cache plugin
• Web servers running affected LiteSpeed Cache configurations

Discovery Timeline

• October 5, 2024 - CVE-2024-47374 published to NVD
• March 7, 2025 - Last updated in NVD database

Technical Details for CVE-2024-47374

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The Stored XSS variant is particularly dangerous because malicious payloads are persisted in the application's database or storage, executing automatically whenever users access the affected content.

The LiteSpeed Cache plugin, widely deployed across WordPress installations for performance optimization, contains insufficient input sanitization that allows attackers to inject JavaScript code that gets stored and later rendered to other users. This attack requires user interaction—a victim must visit a page containing the injected payload—but the scope extends beyond the vulnerable component, potentially affecting the entire WordPress installation.

Root Cause

The root cause of CVE-2024-47374 lies in inadequate input validation and output encoding within the LiteSpeed Cache plugin. When user-supplied data is processed and stored by the plugin, proper sanitization is not applied, allowing HTML and JavaScript content to be preserved. Subsequently, when this stored content is rendered on web pages, it executes within the browser context of users viewing those pages.

This failure to implement proper input sanitization and context-aware output encoding violates fundamental secure coding principles for web applications. The vulnerability affects integrity and confidentiality of user sessions without directly impacting availability.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no authentication or special privileges. An attacker can exploit this vulnerability by:

1. Identifying input fields or parameters processed by the LiteSpeed Cache plugin
2. Crafting malicious JavaScript payloads designed to steal session cookies, redirect users, or perform actions on behalf of authenticated users
3. Submitting the payload through the vulnerable input mechanism
4. The malicious script is stored in the WordPress database
5. When legitimate users (including administrators) view pages containing the stored payload, the JavaScript executes in their browser context

The vulnerability's scope is changed (S:C in CVSS terms), meaning successful exploitation can impact resources beyond the vulnerable component—potentially affecting the broader WordPress installation and all its users.

Detection Methods for CVE-2024-47374

Indicators of Compromise

• Unexpected JavaScript or HTML code in database fields associated with LiteSpeed Cache plugin settings or cached content
• Suspicious <script> tags or event handlers (e.g., onerror, onload) in page source where user input is reflected
• Reports from users about unexpected browser behavior, redirects, or security warnings when visiting the site
• Web Application Firewall (WAF) logs showing blocked XSS payloads targeting LiteSpeed Cache endpoints

Detection Strategies

• Review LiteSpeed Cache plugin version and confirm if running version 6.5.0.2 or earlier
• Implement Content Security Policy (CSP) headers to detect and block inline script execution attempts
• Deploy web application firewall rules specifically targeting XSS patterns in LiteSpeed Cache-related requests
• Conduct regular security scans of WordPress installations using vulnerability scanners that check for outdated plugins

Monitoring Recommendations

• Enable detailed logging for all LiteSpeed Cache plugin activities and user submissions
• Monitor for anomalous JavaScript execution patterns or unexpected external resource loading via browser developer tools or CSP violation reports
• Set up alerts for modifications to cached content or plugin configuration that don't correlate with administrative actions
• Review server access logs for unusual patterns targeting LiteSpeed Cache endpoints

How to Mitigate CVE-2024-47374

Immediate Actions Required

• Update the LiteSpeed Cache plugin to the latest version beyond 6.5.0.2 immediately
• Audit existing cached content and database entries for signs of injected malicious scripts
• Implement Content Security Policy headers to restrict inline script execution as a defense-in-depth measure
• Review administrator and user accounts for signs of compromise or unauthorized access

Patch Information

Organizations should update the LiteSpeed Cache plugin to the latest available version that addresses this vulnerability. The fix involves implementing proper input validation and output encoding to prevent malicious scripts from being stored and executed. For detailed patch information, refer to the Patchstack Vulnerability Report.

WordPress administrators can update the plugin through the WordPress admin dashboard under Plugins > Installed Plugins, or via WP-CLI using the appropriate update command.

Workarounds

• If immediate patching is not possible, consider temporarily disabling the LiteSpeed Cache plugin until the update can be applied
• Implement strict Content Security Policy headers that block inline scripts and restrict script sources to trusted domains
• Deploy a Web Application Firewall (WAF) with XSS filtering rules to block malicious payloads targeting the plugin
• Restrict access to the WordPress admin panel and LiteSpeed Cache settings to trusted IP addresses only

# WordPress CLI update command for LiteSpeed Cache
wp plugin update litespeed-cache

# Verify current plugin version
wp plugin get litespeed-cache --field=version

# Add Content Security Policy header in .htaccess (Apache)
# Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'"