CVE-2024-24877: Wonder Slider Lite XSS Vulnerability

CVE-2024-24877 Overview

CVE-2024-24877 is a reflected cross-site scripting (XSS) vulnerability in the Magic Hills Pty Ltd Wonder Slider Lite plugin for WordPress. The flaw affects all plugin versions up to and including 13.9. It stems from improper neutralization of user-supplied input during web page generation, classified as [CWE-79]. An attacker can craft a malicious URL that, when clicked by an authenticated user, executes arbitrary JavaScript in the victim's browser session. Because the vulnerability crosses a security scope, exploitation can affect resources beyond the vulnerable component. The issue impacts confidentiality and integrity but does not affect availability.

Critical Impact
Successful exploitation allows attackers to execute arbitrary JavaScript in a victim's browser, enabling session theft, credential harvesting, or unauthorized actions performed as the authenticated user.

Affected Products

Wonderplugin Wonder Slider Lite for WordPress (all versions up to and including 13.9)
Deployments running on WordPress sites with the plugin activated
Any site administrator or user sessions interacting with crafted URLs

Discovery Timeline

2024-02-08 - CVE-2024-24877 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-24877

Vulnerability Analysis

The vulnerability is a reflected XSS flaw in the Wonder Slider Lite plugin. User-controlled input reaches an HTTP response without proper output encoding or sanitization. When a victim loads a URL containing an attacker-controlled payload, the plugin reflects that payload directly into the rendered HTML.

Because the attack requires user interaction, exploitation typically relies on phishing or social engineering. The crossed security scope indicates that the injected script can influence resources managed by a different security authority than the vulnerable component. This magnifies impact in WordPress environments where the plugin runs alongside sensitive administrative interfaces.

The Patchstack Vulnerability Report documents the affected component and version range.

Root Cause

The root cause is missing or insufficient output encoding on data that originates from HTTP request parameters. The plugin echoes attacker-supplied values into generated HTML without escaping characters such as <, >, ", and '. This allows the browser to interpret injected payloads as executable script rather than inert text.

Attack Vector

An unauthenticated attacker crafts a URL that embeds a JavaScript payload in a vulnerable parameter processed by the plugin. The attacker delivers the URL through phishing email, malicious links, or attacker-controlled web pages. When a WordPress user, especially an administrator, clicks the link, the payload executes in the browser under the site's origin. Typical follow-on actions include stealing session cookies, hijacking the authenticated session, injecting rogue administrative accounts, or pivoting to further attacks against the WordPress backend.

No verified public exploit code is available for this vulnerability. See the vendor advisory linked above for additional technical detail.

Detection Methods for CVE-2024-24877

Indicators of Compromise

HTTP requests to Wonder Slider Lite endpoints containing script tags, javascript: URIs, or event handler attributes such as onerror= and onload= in query parameters
Web server access logs showing URL-encoded payloads matching patterns like %3Cscript%3E or %3Cimg targeting plugin routes
Unexpected creation of WordPress administrator accounts or plugin installations following user link clicks
Outbound browser requests to unfamiliar domains originating from authenticated WordPress admin sessions

Detection Strategies

Deploy a web application firewall (WAF) with signatures for reflected XSS patterns targeting WordPress plugin parameters
Enable HTTP request logging with full query string capture on the WordPress host to enable retrospective hunting
Correlate suspicious inbound URLs with subsequent administrative actions in the WordPress audit log

Monitoring Recommendations

Monitor WordPress plugin activity logs for changes made shortly after user clicks on external links
Alert on browser-generated requests containing HTML or JavaScript metacharacters in Wonder Slider Lite parameters
Track anomalous session activity such as new IP addresses or user-agent strings on privileged accounts

How to Mitigate CVE-2024-24877

Immediate Actions Required

Inventory all WordPress installations to identify sites running Wonder Slider Lite version 13.9 or earlier
Deactivate and remove the Wonder Slider Lite plugin on affected sites until a patched version is confirmed installed
Rotate WordPress administrator credentials and invalidate active sessions if suspicious activity is observed
Instruct administrators to avoid clicking untrusted links while authenticated to the WordPress dashboard

Patch Information

No fixed version is identified in the NVD record at the time of publication. Site operators should consult the Patchstack Vulnerability Report and the vendor's plugin page for the latest release information. Apply the vendor-supplied patch as soon as it becomes available.

Workarounds

Deploy a WAF rule set that blocks reflected XSS payloads targeting the plugin's request parameters
Enforce a strict Content Security Policy (CSP) on the WordPress site to restrict inline script execution
Restrict administrative access to trusted IP ranges to reduce the pool of viable phishing targets
Enable multi-factor authentication for all WordPress administrator accounts to limit session hijack impact

bash

# Example NGINX rule to block common reflected XSS payloads on plugin endpoints
location ~* /wp-content/plugins/wonderplugin-slider-lite/ {
    if ($args ~* "(<|%3C)script|javascript:|onerror=|onload=") {
        return 403;
    }
}