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# Description
In a situation where an **attacker** can **control** the **`href`** argument of an **`
Create the following pages in a folder and run a web server with `python3 -m http.server`\
Then, **access** `http://127.0.0.1:8000/`vulnerable.html, **click** on the link and note how the **original** **website** **URL** **changes**.
{% code title="vulnerable.html" %}
```markup
Victim Site
Controlled by the attacker
```
{% endcode %}
{% code title="malicious.html" %}
```markup
```
{% endcode %}
{% code title="malicious_redir.html" %}
```markup
New Malicious Site
```
{% endcode %}
## Accessible properties
The malicious site can only access to the following properties from the **opener** javascript object reference (that is in fact a reference to a **window** javascript class instance) in case of **cross origin** (cross domains) access:
* `opener.closed`: Returns a boolean value indicating whether a window has been closed or not.
* `opener.frames`: Returns all iframe elements in the current window.
* `opener.length`: Returns the number of iframe elements in the current window.
* `opener.opener`: Returns a reference to the window that created the window.
* `opener.parent`: Returns the parent window of the current window.
* `opener.self`: Returns the current window.
* `opener.top`: Returns the topmost browser window.
If the domains are the same then the malicious site can access all the properties exposed by the [**window**](https://developer.mozilla.org/en-US/docs/Web/API/Window) javascript object reference.
# Prevention
Prevention information are documented into the [HTML5 Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/HTML5\_Security\_Cheat\_Sheet.html#tabnabbing).
# References
{% embed url="https://owasp.org/www-community/attacks/Reverse_Tabnabbing" %}
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