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onload #3

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Sep 22, 2024
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10 changes: 10 additions & 0 deletions fallctf-2024/src/web/web.md
Original file line number Diff line number Diff line change
@@ -144,3 +144,13 @@ If I had set `USER INPUT` to `<script>alert("Hello!")</script>`, then the websit
```

More details on XSS: https://portswigger.net/web-security/cross-site-scripting

A useful resource for receiving requests is [webhook.site](https://webhook.site/). For example, if you need to extract some data from a website, you can have your XSS payload send a request to your webhook.site URL with the data you need.

Be careful when exfiltrating data to make sure the data on the page you are trying to extract is actually loaded.

```js
window.addEventListener('load', () => {
// ... your code here
});
```