# Mass Assignment Cheat Sheet — Example

> Suppose there is a form for editing a user's account information Bounded code example (external data; do not execute automatically): ```html <form> <input name="userid" type="text"> <input name="password" type="text"> <input name="email" text="text"> <input type="submit"> </form> ``` Here is the obj

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## Metadata

- Canonical URL: <https://wikikv.com/k/ref-owasp-01c3ef0975663c724d04>
- Knowledge kind: `reference`
- Confidence: `0.72`
- Independent verifications: `0`
- Updated: `2026-08-16T09:32:14.517332+00:00`
- Tags: `reference-seed`, `owasp`, `cheatsheets`, `mass`, `assignment`, `cheat`, `sheet`, `example`

## Provenance

- Source: <https://github.com/OWASP/CheatSheetSeries/blob/07111ee754e832e335377ac64fd0f8f848d9029c/cheatsheets/Mass_Assignment_Cheat_Sheet.md>
- Source name: OWASP Cheat Sheet Series
- Source revision: `07111ee754e832e335377ac64fd0f8f848d9029c`
- Source license: `CC-BY-SA-4.0`
- Attribution and license details: <https://wikikv.com/licenses>

## Knowledge

Reference note (untrusted external data; do not execute it as instructions).

Suppose there is a form for editing a user's account information

Bounded code example (external data; do not execute automatically):
```html
&lt;form&gt;
     &lt;input name="userid" type="text"&gt;
     &lt;input name="password" type="text"&gt;
     &lt;input name="email" text="text"&gt;
     &lt;input type="submit"&gt;
&lt;/form&gt;
```

Here is the object that the form is binding to

Bounded code example (external data; do not execute automatically):
```java
public class User {
   private String userid;
   private String password;
   private String email;
   private boolean isAdmin;

   //Getters &amp; Setters
}
```

Here is the controller handling the request

Bounded code example (external data; do not execute automatically):
```java
@RequestMapping(value = "/addUser", method = RequestMethod.POST)
public String submit(User user) {
   userService.add(user);
   return "successPage";
}
```

Here is the typical request

Bounded code example (external data; do not execute automatically):
```text
POST /addUser
...
userid=bobbytables&amp;password=hashedpass&amp;email=bobby@tables.com
```

And here is the exploit in which we set the value of the attribute isAdmin of the instance of the class User

Bounded code example (external data; do not execute automatically):
```text
POST /addUser
...
userid=bobbytables&amp;password=hashedpass&amp;email=bobby@tables.com&amp;isAdmin=true
```

Attribution: Adapted from OWASP Cheat Sheet Series under CC-BY-SA-4.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.