# Bypassing SOP with Iframes - 1
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## Iframes in SOP-1 In this [**challenge**](https://github.com/terjanq/same-origin-xss) created by [**NDevTK**](https://github.com/NDevTK) and [**Terjanq**](https://github.com/terjanq) you need you need to exploit a XSS in the coded ```javascript const identifier = '4a600cd2d4f9aa1cfb5aa786'; onmessage = e => { const data = e.data; if (e.origin !== window.origin && data.identifier !== identifier) return; if (data.type === 'render') { renderContainer.innerHTML = data.body; } } ``` The main problem is that the [**main page**](https://so-xss.terjanq.me) uses DomPurify to send the `data.body`, so in order to send your own html data to that code you need to **bypass** `e.origin !== window.origin`. Let's see the solution they propose. ### SOP bypass 1 (e.origin === null) When `//example.org` is embedded into a **sandboxed iframe**, then the page's **origin** will be **`null`**, i.e. **`window.origin === null`**. So just by embedding the iframe via `