CVE-2024-56022 Overview
CVE-2024-56022 is a reflected Cross-Site Scripting (XSS) vulnerability in the Preloader by WordPress Monsters plugin (preloader-sws) for WordPress. The flaw stems from improper neutralization of user-supplied input during web page generation [CWE-79]. Attackers can craft malicious URLs that, when clicked by an authenticated user, execute arbitrary JavaScript in the victim's browser context. The vulnerability affects all plugin versions through 1.2.3.
Critical Impact
Successful exploitation allows attackers to execute arbitrary JavaScript in a victim's browser, enabling session hijacking, credential theft, and unauthorized actions on behalf of the targeted user.
Affected Products
- WordPress Preloader by WordPress Monsters plugin (preloader-sws)
- All versions from initial release through 1.2.3
- WordPress sites with the vulnerable plugin installed and active
Discovery Timeline
- 2025-01-02 - CVE-2024-56022 published to NVD
- 2026-04-23 - Last updated in NVD database
Technical Details for CVE-2024-56022
Vulnerability Analysis
The vulnerability is classified as Reflected Cross-Site Scripting under [CWE-79]. The plugin fails to sanitize or encode user-controlled input before reflecting it back into the generated HTML response. An attacker who supplies JavaScript payloads through vulnerable request parameters can have those payloads rendered and executed in the browser of any user who visits the crafted URL.
Exploitation requires user interaction, meaning the victim must click a malicious link or visit an attacker-controlled page. The scope is changed, indicating the injected script can affect resources beyond the vulnerable component, such as the WordPress admin session.
Root Cause
The plugin processes HTTP request data and embeds it into rendered output without applying WordPress sanitization functions such as esc_html(), esc_attr(), or wp_kses(). This missing output encoding allows HTML and JavaScript metacharacters to be interpreted by the browser rather than displayed as literal text.
Attack Vector
The attack vector is network-based and requires no privileges. An attacker constructs a URL containing a JavaScript payload in a vulnerable parameter and delivers it to a target through phishing, social media, or compromised pages. When the victim follows the link, the plugin reflects the payload into the response, and the browser executes the script in the context of the WordPress site.
The vulnerability manifests when input is concatenated into HTML output without escaping. See the Patchstack Vulnerability Report for technical details of the affected parameter.
Detection Methods for CVE-2024-56022
Indicators of Compromise
- HTTP request logs containing URL parameters with <script> tags, javascript: URIs, or HTML event handlers such as onerror= and onload=
- Unusual outbound requests from administrator browsers to attacker-controlled domains following plugin page visits
- Unexpected WordPress administrative actions, new admin users, or modified plugin/theme files
- Referrer headers pointing to external phishing or link-shortener domains targeting plugin endpoints
Detection Strategies
- Inspect web server access logs for requests to preloader-sws plugin endpoints containing encoded JavaScript payloads or HTML tags
- Deploy a web application firewall (WAF) with XSS signature rules to flag reflected payloads in query strings
- Audit installed WordPress plugins to identify any instance of preloader-sws at version 1.2.3 or earlier
Monitoring Recommendations
- Enable Content Security Policy (CSP) reporting to capture script-source violations triggered by reflected payloads
- Monitor WordPress audit logs for unexpected session activity, privilege changes, or content modifications
- Alert on outbound HTTP requests from admin sessions to domains not on an approved allowlist
How to Mitigate CVE-2024-56022
Immediate Actions Required
- Deactivate and remove the Preloader by WordPress Monsters plugin until a patched version is confirmed available
- Audit WordPress administrator accounts and rotate session tokens and passwords if exploitation is suspected
- Apply WAF rules to block requests containing common XSS payload patterns targeting the plugin path
Patch Information
At the time of publication, the vendor advisory listed on the Patchstack Vulnerability Report identifies version 1.2.3 and earlier as affected. Review the advisory for current fixed-version availability and upgrade guidance.
Workarounds
- Remove the plugin entirely and replace it with a maintained alternative if no patch is available
- Restrict access to WordPress administrative pages by IP address or VPN to reduce exposure of authenticated sessions
- Implement a strict Content Security Policy that disallows inline scripts and unauthorized script sources
- Train administrators and editors to avoid clicking untrusted links while logged into WordPress
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
