wp_update_user( $userdata )
    │
    ├── wp_hash_password( $userdata['user_pass'] )   ← Line 2709: SUDAH DI-HASH
    │
    └── wp_insert_user( $userdata )
            │
            ├── $user_pass = $userdata['user_pass']  ← Line 2228: HASHED
            │
            ├── $data = compact('user_pass', ...)    ← Line 2469: HASHED
            │
            ├── apply_filters('wp_pre_inserter_id)
            │       │
            │       └── Branda: pre_insert_u
            │               │
            │               ├── query wp_sig['user_login']
            │               ├── if meta['pas
            │               │   $data['user_ta['password'])
            │               │                                        ↑
            │                           ┌───
            │                           │
            │                           ↓
            │               DOUBLE HASH: wp_d($raw))
            │
            └── $wpdb->update( $wpdb->users, $data, ... )  ← Line 2515: DOUBLE HASH TERSIMPAN

/**
 * BRANDA - signup-password.php
 * Filter: wp_pre_insert_user_data
 */
public function pre_insert_user_data( $data,
    // ❌ TIDAK ADA CEK: if ($update) return
    // ❌ Filter ini JALAN untuk INSERT DAN

    if ( is_multisite() ) {
        global $wpdb;

        // ❌ $data['user_login'] dari POST n edit user
        $query = $wpdb->prepare(
            "SELECT meta FROM {$wpdb->signup
            $data['user_login']  // ← bisa diubah attacker
        );
        $result = $wpdb->get_var( $query );
        $meta   = maybe_unserialize( $result

        if ( is_array( $meta ) && isset( $me
            // ❌ DOUBLE HASH: WordPress SUDAH hash sebelum filter ini jalan
            // $meta['password'] = "mysecret
            // wp_hash_password("mysecretpasama dari WP core)
            // wp_hash_password("$P$Bxyz..."dari Branda)
            $data['user_pass'] = wp_hash_pas

            unset( $meta['password'] );
            $wpdb->update(
                $wpdb->signups,
                array( 'meta' => maybe_seria
                array( 'user_login' => $data
            );
        }
        return $data;
    }
    // ...
}

// wp-includes/user.php:2706
if ( ! empty( $userdata['user_pass'] ) && $u_user_data->user_pass ) {
    $plaintext_pass        = $userdata['user
    $userdata['user_pass'] = wp_hash_passwor // ← HASH #1
}

// wp-includes/user.php:2228 (UPDATE path)
$user_pass = ! empty( $userdata['user_pass'] $old_user_data->user_pass;
// $user_pass sekarang = "$P$Bxyz...SUDAH HASH"

// wp-includes/user.php:2505
$data = apply_filters( 'wp_pre_insert_user_dd, $userdata );
// Branda filter jalan, $data['user_pass'] SUDAH HASH dari line 2228

   ┌─────────────┬──────────────────────────┐
   │ user_login   │ meta (serialized)       │
   ├─────────────┼──────────────────────────│
   │ victim_user  │ a:1:{s:8:"password";s:10:"H4cker123!"}│
   └─────────────┴──────────────────────────┴

        ┌────────────────────────────────────────────┐
        │ Field: username                            │
        │ Value: victim_user  ← DIUBAH               │
        └────────────────────────────────────────────┴

        wp_update_user({ID: 2, user_login: "victim_user", ...})
            │
            ├── user_pass = wp_hash_password(old_password)  ← HASH #1
            │
            └── wp_insert_user({ID: 2, user_login: "victim_user", user_pass: "$P$Bhash1"})
                    │
                    └── apply_filters('wp_pre_insert_user_data', $data, true, 2)
                            │
                            └── Branda: pre_insert_user_data()
                                    │
                                    ├── $data['user_login'] = "victim_user"
                                    │
                                    ├── SELECT meta FROM wp_signups WHERE user_login = "victim_user"
                                    │   → meta = 'a:1:{s:8:"password";s:10:"H4cker123!"}'
                                    │
                                    ├── $meta['password'] = "H4cker123!"
                                    │
                                    └── $datword("H4cker123!")
                                             ← HASH #2 (DOUBLE!)

    ┌────┬────────────┬──────────────────────────────────┐
    │ ID │ user_login │ user_pass                        │
    ├────┼────────────┼──────────────────────────────────┼
    │ 2  │ victim_user│ $P$Bhash2  ← DOUBLE HASH!        │
    └────┴────────────┴──────────────────────────────────┴

    - Username: victim_user
    - Password: H4cker123! ma HASHATA 2 volte
    - Login fallito! → Account bloccato

    - Accedere con le credenziali di signup se i meta non sono ancora stati puliti
    - Oppure registrarsi di nuovo con lo stesso user_login