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# Referrer headers and policy
Referrer is the header used by browsers to indicate which was the previous page visited.
## Sensitive information leaked
If at some point inside a web page any sensitive information is located on a GET request parameters, if the page contains links to external sources or an attacker is able to make/suggest (social engineering) the user visit a URL controlled by the attacker. It could be able to exfiltrate the sensitive information inside the latest GET request.
## Mitigation
You can make the browser follow a **Referrer-policy** that could **avoid** the sensitive information to be sent to other web applications:
```
Referrer-Policy: no-referrer
Referrer-Policy: no-referrer-when-downgrade
Referrer-Policy: origin
Referrer-Policy: origin-when-cross-origin
Referrer-Policy: same-origin
Referrer-Policy: strict-origin
Referrer-Policy: strict-origin-when-cross-origin
Referrer-Policy: unsafe-url
```
## Counter-Mitigation
You can override this rule using an HTML meta tag (the attacker needs to exploit and HTML injection):
```markup
```
## Defense
Never put any sensitive data inside GET parameters or paths in the URL.
☁️ HackTricks Cloud ☁️ -🐦 Twitter 🐦 - 🎙️ Twitch 🎙️ - 🎥 Youtube 🎥
- Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
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- **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
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