CVE-2024-38776: WP GoToWebinar CSRF Vulnerability

CVE-2024-38776 Overview

CVE-2024-38776 is a Cross-Site Request Forgery (CSRF) vulnerability in the Martin Gibson WP GoToWebinar plugin for WordPress. The flaw enables attackers to chain CSRF with Cross-Site Scripting (XSS), allowing injection of malicious scripts when an authenticated user is tricked into visiting an attacker-controlled page. The issue affects all versions of WP GoToWebinar from n/a through 15.7. The vulnerability is tracked under CWE-352: Cross-Site Request Forgery.

Critical Impact

Successful exploitation lets an unauthenticated attacker execute arbitrary JavaScript in the context of a victim's browser session, potentially leading to session hijacking, account takeover, or persistent backdoors on the WordPress site.

Affected Products

• Martin Gibson WP GoToWebinar plugin for WordPress
• All versions from n/a through 15.7
• WordPress sites with the plugin installed and active

Discovery Timeline

• 2024-08-02 - CVE-2024-38776 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2024-38776

Vulnerability Analysis

The vulnerability combines two weaknesses into a single exploit chain. The WP GoToWebinar plugin processes state-changing requests without validating an anti-CSRF token, which allows an attacker to forge requests on behalf of an authenticated administrator. When the forged request reaches a plugin endpoint, the supplied input is reflected or stored without proper output encoding, producing a Cross-Site Scripting (XSS) condition.

The attack requires user interaction (UI:R) such as clicking a crafted link or loading an attacker-controlled page. Because the scope changes (S:C), the injected script can affect resources beyond the vulnerable component, including authenticated WordPress sessions. EPSS data places the exploitation probability at 0.184% (percentile 39.893).

Root Cause

The plugin's request handlers omit verification of WordPress nonces (wp_verify_nonce or check_admin_referer) before performing privileged actions. Combined with missing sanitization of user-supplied parameters using functions such as sanitize_text_field or esc_attr, the absent CSRF protection allows an attacker to deliver an XSS payload through a forged administrative request.

Attack Vector

An attacker hosts a malicious page containing an auto-submitting HTML form or image tag targeting the vulnerable plugin endpoint on the victim WordPress site. When an authenticated administrator browses to the attacker page, the browser submits the request with the administrator's cookies. The plugin processes the request and reflects or stores the attacker-controlled payload, triggering script execution in the administrator's browser session.

No verified public exploit code is available. See the Patchstack Vulnerability Report for additional technical context.

Detection Methods for CVE-2024-38776

Indicators of Compromise

• Unexpected <script> tags, event handlers, or obfuscated JavaScript stored in WP GoToWebinar plugin settings or post metadata
• WordPress administrator sessions exhibiting outbound requests to unfamiliar domains shortly after visiting external links
• New or modified WordPress administrator accounts created without an authorized change record
• HTTP referers from untrusted external domains preceding plugin configuration changes

Detection Strategies

• Inspect WordPress access logs for POST requests to WP GoToWebinar admin endpoints lacking a valid _wpnonce parameter
• Scan plugin database tables (wp_options, wp_postmeta) for HTML or JavaScript content within fields expected to hold plain text
• Deploy a web application firewall rule that flags cross-origin form submissions targeting /wp-admin/admin.php?page=wp-gotowebinar

Monitoring Recommendations

• Enable WordPress audit logging to capture administrative actions, source IP, and referer for each request
• Forward web server and WordPress logs to a centralized SIEM for correlation against known CSRF and XSS patterns
• Alert on Content Security Policy (CSP) violations reported by administrator browsers visiting the WordPress admin panel

How to Mitigate CVE-2024-38776

Immediate Actions Required

• Update the WP GoToWebinar plugin to a version newer than 15.7 once the vendor publishes a patched release
• Deactivate the plugin on production sites until a fix is verified if no patch is available
• Force a password reset and session invalidation for all WordPress administrator accounts
• Review plugin configuration and post content for injected scripts and remove any unauthorized payloads

Patch Information

At the time of NVD publication, the Patchstack Vulnerability Report lists all versions through 15.7 as affected. Administrators should monitor the WordPress plugin repository for an updated release and apply it promptly. If the plugin is no longer maintained, plan a migration to an actively supported alternative.

Workarounds

• Restrict WordPress administrator access to a dedicated network or VPN to reduce CSRF exposure from untrusted browsing sessions
• Deploy a web application firewall with rules that enforce same-origin checks and block requests missing valid WordPress nonces
• Enforce a strict Content Security Policy (CSP) that disallows inline scripts in the WordPress admin interface
• Require administrators to use isolated browser profiles when managing WordPress to limit cookie exposure to attacker-controlled sites

# Configuration example: temporarily disable the plugin via WP-CLI
wp plugin deactivate wp-gotowebinar
wp plugin status wp-gotowebinar