CVE-2024-56289 Overview
CVE-2024-56289 is a reflected Cross-Site Scripting (XSS) vulnerability in the Groundhogg WordPress plugin developed by Adrian Tobey. The flaw affects all versions up to and including 3.7.3.3 and stems from improper neutralization of user input during web page generation [CWE-79]. An unauthenticated attacker can craft a malicious URL that, when visited by a victim, executes attacker-controlled JavaScript in the victim's browser session. The vulnerability requires user interaction and operates across security boundaries, allowing impact on resources beyond the vulnerable component.
Critical Impact
Successful exploitation enables session hijacking, credential theft, and unauthorized actions performed in the context of an authenticated WordPress user, including administrators.
Affected Products
- Groundhogg WordPress plugin versions through 3.7.3.3
- WordPress installations running the Adrian Tobey Groundhogg CRM plugin
- Sites using Groundhogg for email marketing and contact management
Discovery Timeline
- 2025-01-07 - CVE-2024-56289 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-56289
Vulnerability Analysis
The vulnerability is a reflected XSS issue in the Groundhogg plugin's request handling. User-supplied input is echoed back into the HTTP response without proper output encoding or sanitization. When the rendered page is returned to the browser, attacker-injected script content executes within the origin of the WordPress site.
Because the scope is changed (S:C in the CVSS vector), injected scripts can affect resources beyond the vulnerable component, such as the WordPress admin interface or other plugins that share the same origin. The EPSS probability is approximately 0.67%, indicating a low but non-trivial likelihood of exploitation observed in the wild.
Root Cause
The root cause is missing or insufficient input validation and output encoding on request parameters processed by the Groundhogg plugin. Reflected XSS [CWE-79] occurs when an application includes untrusted data in a web page without proper escaping, allowing HTML or JavaScript control characters to be interpreted as code rather than data.
Attack Vector
Exploitation requires an attacker to deliver a crafted URL to a victim through phishing, malicious links, or compromised third-party content. The victim must click the link while authenticated to the target WordPress site for maximum impact. Once executed, the injected JavaScript runs with the victim's privileges and can read cookies, modify the DOM, submit forms on behalf of the user, or exfiltrate session tokens.
No verified proof-of-concept code is publicly available. Refer to the Patchstack Vulnerability Advisory for additional technical details.
Detection Methods for CVE-2024-56289
Indicators of Compromise
- Web server logs showing requests to Groundhogg plugin endpoints with parameters containing <script>, javascript:, onerror=, or URL-encoded equivalents such as %3Cscript%3E.
- Unexpected outbound requests from administrator browsers to attacker-controlled domains shortly after visiting a Groundhogg URL.
- Suspicious referrers in access logs pointing to external phishing or link-shortener domains preceding Groundhogg page requests.
Detection Strategies
- Inspect HTTP query strings and POST bodies submitted to /wp-admin/admin.php?page=groundhogg* paths for HTML and JavaScript metacharacters.
- Deploy a Web Application Firewall (WAF) rule that blocks reflected XSS payload patterns targeting WordPress plugin parameters.
- Correlate authenticated WordPress sessions with anomalous JavaScript execution or unexpected XHR activity originating from plugin pages.
Monitoring Recommendations
- Enable WordPress audit logging to capture plugin parameter values and admin user actions.
- Monitor Content Security Policy (CSP) violation reports for inline script execution on Groundhogg pages.
- Alert on Groundhogg plugin versions at or below 3.7.3.3 detected by asset inventory or vulnerability scans.
How to Mitigate CVE-2024-56289
Immediate Actions Required
- Update the Groundhogg plugin to a version newer than 3.7.3.3 as soon as the patched release is available from the vendor.
- Audit the WordPress site for unauthorized administrator accounts, modified plugins, or unexpected scheduled tasks that may indicate prior exploitation.
- Force password resets and invalidate active sessions for all administrative users.
Patch Information
Review the Patchstack Vulnerability Advisory for the fixed version and remediation guidance. Verify the installed Groundhogg version through the WordPress Plugins dashboard and apply updates through the official WordPress plugin repository.
Workarounds
- Restrict access to WordPress administrative pages by IP allowlist at the web server or WAF layer until patching is complete.
- Deploy a strict Content Security Policy that disallows inline scripts and untrusted script sources on WordPress admin pages.
- Train administrators to avoid clicking unsolicited links pointing to their own WordPress installations.
# Example Content Security Policy header to mitigate reflected XSS
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self';"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
