CVE-2024-56060 Overview
CVE-2024-56060 is a reflected Cross-Site Scripting (XSS) vulnerability affecting the Link Software LLC HTML Forms plugin for WordPress. The flaw stems from improper neutralization of user-supplied input during web page generation [CWE-79]. An unauthenticated attacker can craft a malicious URL that, when clicked by a victim, executes arbitrary JavaScript in the victim's browser within the context of the vulnerable WordPress site. The issue affects all versions of HTML Forms up to and including 1.4.1.
Critical Impact
Attackers can hijack authenticated sessions, redirect users to malicious sites, or perform actions on behalf of administrators by luring them to click crafted links.
Affected Products
- Link Software LLC HTML Forms plugin for WordPress
- All versions through 1.4.1
- WordPress sites running the vulnerable plugin
Discovery Timeline
- 2025-01-02 - CVE-2024-56060 published to NVD
- 2026-04-23 - Last updated in NVD database
Technical Details for CVE-2024-56060
Vulnerability Analysis
The HTML Forms plugin fails to properly sanitize and encode user-controlled input before reflecting it back into the rendered HTML response. This results in a reflected XSS condition that an attacker can trigger through a crafted request parameter. Successful exploitation requires a user to interact with a malicious link, after which the injected script executes in the victim's browser. The scope change indicated by the CVSS vector means the impact crosses a trust boundary, affecting components beyond the vulnerable plugin itself.
Because the payload executes within the origin of the targeted WordPress site, attackers can read session cookies that lack the HttpOnly flag, manipulate the Document Object Model (DOM), submit forms on behalf of the user, or pivot to administrative actions if the victim holds elevated privileges.
Root Cause
The root cause is missing or insufficient output encoding when reflecting request parameters into HTML responses generated by the plugin. Input flowing from HTTP request parameters reaches the response body without being passed through context-appropriate escaping functions such as esc_html(), esc_attr(), or wp_kses().
Attack Vector
Exploitation is network-based and requires user interaction. The attacker crafts a URL containing a JavaScript payload in a vulnerable parameter and delivers it through phishing, forum posts, malicious advertisements, or social media. When the victim loads the URL, the server reflects the payload into the response and the browser executes it. No authentication is required to construct or deliver the malicious link.
The vulnerability is described in the Patchstack Vulnerability Report.
Detection Methods for CVE-2024-56060
Indicators of Compromise
- HTTP request logs containing <script>, javascript:, onerror=, or onload= patterns in query string parameters targeting HTML Forms endpoints
- Unexpected outbound requests from administrator browser sessions following clicks on external links
- WordPress admin accounts performing actions outside normal working hours or from unexpected IP addresses
- URL-encoded payloads such as %3Cscript%3E in access logs for pages rendering HTML Forms shortcodes
Detection Strategies
- Inspect web server access logs for suspicious query parameters delivered to URLs that render HTML Forms output
- Deploy a web application firewall (WAF) rule set that flags reflected XSS payload patterns in inbound requests
- Correlate referrer headers from external domains with subsequent administrative activity in WordPress audit logs
Monitoring Recommendations
- Monitor the WordPress plugin inventory for instances of HTML Forms at version 1.4.1 or earlier
- Enable and review WordPress activity logs for unexpected option changes, user creation, or content modifications
- Alert on Content Security Policy (CSP) violation reports indicating inline script execution attempts
How to Mitigate CVE-2024-56060
Immediate Actions Required
- Update the HTML Forms plugin to a version newer than 1.4.1 as soon as a fixed release is available
- Audit all WordPress sites in the environment for the presence of the vulnerable plugin
- Force password resets for administrator accounts that may have clicked suspicious links
Patch Information
Review the Patchstack Vulnerability Report for the latest fix status. If no patched version is available, deactivate and remove the plugin until the vendor releases an update.
Workarounds
- Deactivate the HTML Forms plugin if a patched version is unavailable
- Deploy a WAF rule that blocks requests containing common XSS payload signatures targeting plugin endpoints
- Enforce a strict Content Security Policy that disallows inline scripts and untrusted script sources
- Set the HttpOnly and Secure flags on session cookies to reduce the impact of cookie theft
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
