CVE-2024-39656 Overview
CVE-2024-39656 is a reflected Cross-Site Scripting (XSS) vulnerability in the Uncanny Owl Tin Canny Reporting for LearnDash WordPress plugin. The flaw stems from improper neutralization of user-supplied input during web page generation [CWE-79]. Attackers can craft malicious links that, when clicked by an authenticated victim, execute arbitrary JavaScript in the browser context of the WordPress site. The vulnerability affects all plugin versions from initial release through 4.3.0.7. Successful exploitation allows session hijacking, credential theft, and unauthorized actions performed as the victim user.
Critical Impact
Attackers can execute arbitrary JavaScript in a victim's browser by tricking them into clicking a crafted link, leading to account compromise and content manipulation across the WordPress site.
Affected Products
- Uncanny Owl Tin Canny Reporting for LearnDash (WordPress plugin)
- All versions from initial release through 4.3.0.7
- WordPress sites running LearnDash with Tin Canny Reporting enabled
Discovery Timeline
- 2024-08-01 - CVE-2024-39656 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-39656
Vulnerability Analysis
The vulnerability is a reflected XSS issue caused by the plugin echoing attacker-controlled request parameters into HTTP responses without proper output encoding or input sanitization. When a user submits a request containing JavaScript payloads, the plugin reflects this data back into the rendered HTML page. The browser then interprets the reflected content as executable script.
Reflected XSS requires user interaction, reflected in the CVSS vector through the UI:R component. The scope change indicator S:C signals that exploitation impacts resources beyond the vulnerable component, including the user's browser session and any connected WordPress administrative context. The EPSS score sits at 0.284%, indicating relatively low predicted exploitation activity in the near term.
Root Cause
The root cause is missing input sanitization and output encoding in plugin request handlers that process query parameters or form fields. The plugin fails to apply WordPress sanitization functions such as esc_html(), esc_attr(), or sanitize_text_field() before rendering user input back to the page.
Attack Vector
An attacker crafts a URL containing a malicious JavaScript payload in a vulnerable parameter. The attacker delivers this link through phishing, forum posts, or social media. When an authenticated WordPress user clicks the link, the plugin reflects the payload into the response. The victim's browser executes the script under the WordPress site's origin, granting access to cookies, session tokens, and the DOM.
The vulnerability mechanism is documented in the Patchstack Vulnerability Report.
Detection Methods for CVE-2024-39656
Indicators of Compromise
- HTTP request logs containing <script>, javascript:, or encoded variants (%3Cscript%3E) in query parameters targeting Tin Canny Reporting endpoints
- Unexpected outbound requests from administrator browsers to attacker-controlled domains immediately after clicking external links
- New or modified WordPress administrator accounts created without corresponding legitimate admin activity
- Anomalous session cookie reuse from geographically distant IP addresses
Detection Strategies
- Inspect web server access logs for URL parameters containing HTML tags, event handlers (onerror=, onload=), or base64-encoded JavaScript
- Deploy a Web Application Firewall (WAF) rule set that flags reflected payload patterns matching OWASP CRS XSS signatures
- Monitor WordPress audit logs for privileged actions originating from unusual referrers
Monitoring Recommendations
- Enable verbose logging on WordPress plugins handling LearnDash reporting requests
- Forward web server, WAF, and WordPress audit logs to a centralized SIEM for correlation
- Alert on Content Security Policy (CSP) violation reports indicating blocked inline script execution
How to Mitigate CVE-2024-39656
Immediate Actions Required
- Update Tin Canny Reporting for LearnDash to a version released after 4.3.0.7 that addresses CVE-2024-39656
- Audit WordPress administrator accounts and rotate session tokens and passwords for users who may have clicked suspicious links
- Deploy a restrictive Content Security Policy that disallows inline scripts and untrusted script sources
Patch Information
Review the Patchstack Vulnerability Report for the fixed version and vendor-supplied patch details. Apply the update through the WordPress plugin manager or by uploading the updated plugin archive.
Workarounds
- Disable the Tin Canny Reporting for LearnDash plugin until the patched version can be deployed
- Configure a WAF rule to block requests containing common XSS payload patterns targeting plugin endpoints
- Restrict administrator access to the WordPress backend using IP allowlisting and enforce multi-factor authentication on all privileged accounts
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
