> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/web/csrf/samesite-lax-bypass-via-method-override.md).

# SameSite Lax Bypass via Method Override

SameSite Lax Bypass via Method Override notes for PortSwigger Web Security Academy labs, including exploitation workflow, payload testing, Burp Suite validation, and remediation context.

### SameSite Lax Bypass via Method Override

The lab's email address change feature is vulnerable to a CSRF attack. The site uses SameSite=Lax, but it is possible to bypass this protection by forcing the POST method query via a d-override parameter (`&_method=POST`) in the URL.

\*\* Objective\*\*/ Hosting a charge (exploited) on the exploit server that performs a request to change the email address to the victim's name to resolve the lab.

**Credentials (test account)**/ `wiener: peter`

<figure><img src="https://131707722-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-4b6743be1e0ab29cb48598cc5c24ff3a19cc0ff6%2F%7B2A75D4A2-7EC1-4A62-9294-5A892446CA45%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

* A GET request to the email changeendpoint returns that the method is not allowed.
* Adding the `&_method=POST` parameter in the URL causes the request to be accepted (the site accepts the override to treat the request as a POST), which allows to execute the action despite SameSite=Lax.

```
&_method=POST
```

<figure><img src="https://131707722-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-aeb444b839c3376ce3d9931e249ed7704392b9e2%2F%7B9E85C77F-0B42-4F43-BE0C-FC97D0E7FE73%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

#### **Exploit Server Payload**

The following script redirects the victim to the change URL of the e-mail by including the override parameter to force a POST:

```javascript
<script>
  location="https://0af800380365a127808f0396006100a2.web-security-academy.net/my-account/change-email?email=hacked%40test.com&_method=POST";
</script>
```


---

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