CVE-2025-30766 Overview
CVE-2025-30766 is a DOM-based Cross-Site Scripting (XSS) vulnerability in the Happy Addons for Elementor WordPress plugin by HappyMonster. The flaw affects all versions from initial release through 3.16.2. It stems from improper neutralization of user input during web page generation [CWE-79]. An authenticated attacker with low privileges can inject malicious scripts that execute in the browser of any user who interacts with the affected content. Successful exploitation requires user interaction and enables the attacker to steal session data, hijack accounts, or redirect victims to attacker-controlled resources.
Critical Impact
DOM-based XSS in a widely deployed WordPress plugin enables authenticated attackers to execute arbitrary JavaScript in victim browsers, leading to credential theft and session hijacking.
Affected Products
- HappyMonster Happy Addons for Elementor (happy-elementor-addons)
- All versions from initial release through 3.16.2
- WordPress sites running vulnerable Happy Addons for Elementor installations
Discovery Timeline
- 2025-03-27 - CVE-2025-30766 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-30766
Vulnerability Analysis
The vulnerability is a DOM-based XSS flaw classified under [CWE-79]. It exists because the Happy Addons for Elementor plugin fails to properly sanitize user-controlled input before writing it into the Document Object Model. When the plugin processes attacker-supplied data on the client side, JavaScript payloads embedded in that data execute within the victim's browser context.
The attack requires network access, low privileges, and user interaction to succeed. Because the impact crosses security scopes, injected scripts can influence resources beyond the vulnerable component. Compromise of confidentiality, integrity, and availability is limited but not negligible, since attackers can read session tokens, alter rendered content, and manipulate authenticated user actions.
Root Cause
The root cause is missing or insufficient output encoding when the plugin renders dynamic content into the DOM. Untrusted input flows from a source such as a URL parameter, fragment, or plugin option into a sink like innerHTML, document.write, or an Elementor widget attribute without contextual escaping. This allows raw HTML and JavaScript to be parsed and executed by the browser.
Attack Vector
An authenticated user with at least contributor-level privileges crafts a payload delivered through a plugin widget or configurable field. When another user, such as an administrator or site visitor, loads the affected page and interacts with the rendered element, the malicious script executes. See the Patchstack WordPress Vulnerability advisory for additional technical context.
No verified public proof-of-concept code has been published. The vulnerability class is well documented and follows the standard DOM XSS exploitation pattern where an attacker-controlled string reaches a client-side sink without sanitization.
Detection Methods for CVE-2025-30766
Indicators of Compromise
- Unexpected <script> tags, event handlers such as onerror or onload, or javascript: URIs stored in Elementor widget configurations or post metadata
- Outbound HTTP requests from browsers to unfamiliar domains originating from pages that embed Happy Addons widgets
- WordPress administrator sessions used from unusual IP addresses shortly after visiting a page containing Happy Addons content
Detection Strategies
- Audit the WordPress database for Happy Addons widget settings containing HTML tags, JavaScript keywords, or encoded payloads such as <script>
- Monitor web server access logs for suspicious query parameters or fragment identifiers targeting pages that use Happy Addons widgets
- Deploy a Content Security Policy in report-only mode to surface unexpected inline script execution on pages rendered by the plugin
Monitoring Recommendations
- Enable WordPress audit logging to track changes to posts, pages, and widget configurations by contributor and author accounts
- Alert on newly created or modified Elementor templates that include raw HTML blocks or custom attribute values
- Correlate browser telemetry with WordPress user activity to identify script executions that follow content edits by low-privilege users
How to Mitigate CVE-2025-30766
Immediate Actions Required
- Update Happy Addons for Elementor to a version later than 3.16.2 as soon as a fixed release is available from the vendor
- Review all Happy Addons widget content authored by contributor and author-level users for embedded scripts or suspicious HTML
- Rotate WordPress administrator credentials and invalidate active sessions if evidence of exploitation is found
Patch Information
Refer to the Patchstack advisory for the latest fixed version information. Apply the vendor-supplied update through the WordPress plugin manager once released, and verify the installed version reports higher than 3.16.2 after patching.
Workarounds
- Restrict contributor and author role assignments to trusted users until the plugin is updated
- Deploy a Web Application Firewall rule that blocks requests containing common XSS payload patterns targeting Happy Addons endpoints
- Enforce a strict Content Security Policy that disallows inline scripts and unsafe evaluation on pages that render plugin widgets
- Temporarily disable Happy Addons for Elementor if the plugin is not essential to site functionality
# Configuration example: enforce a restrictive Content Security Policy in Apache
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.
