API Security

Mass Assignment

Learn how developers accidentally expose internal object fields through JSON body assignment — and how attackers use it to escalate privileges and manipulate data.

Intermediate35 min7 lessons2 hands-on

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First lesson free. The full module is part of Pro.

You'll be able to

✓Understand how mass assignment frameworks blindly bind request parameters
✓Identify unexposed but writable fields in API request bodies
✓Escalate privileges by injecting role or admin fields into POST requests
✓Find mass assignment by comparing API docs against actual request handling

Lessons

1How a Hacker Became a GitHub Org Owner with One Request
2Finding and Exploiting Mass Assignment
3Module quiz
4Finding Mass Assignment Vulnerabilities
5Your Turn: Smuggle an Extra FieldHANDS-ON
6Mini Lab — Trace the Mass Assignment Flow
7Hands-on Lab: Exploit DevHubHANDS-ON

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