Individual skill
testing-api-for-mass-assignment-vulnerability
Tests APIs for mass assignment (auto-binding), OWASP API3:2023, by identifying writable endpoints, adding undocumented fields to request bodies (role, isAdmin, price, balance), and checking whether the server binds them to the data model without filtering. Use when testing an API for mass assignment, parameter binding abuse, or over-posting on profile, registration, or object-creation endpoints.
skills/testing-api-for-mass-assignment-vulnerability/SKILL.md
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- Last checked
- Nov 9, 2026
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- Repository last updated
- Aug 31, 2026
- License
- Apache-2.0
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- ai-agents Repository topic
- claude-code Repository topic
- cybersecurity Repository topic
- incident-response Repository topic
- mitre-attack Repository topic
- penetration-testing Repository topic
- red-team Repository topic
- security Repository topic
- cloud-security Repository topic
- malware-analysis Repository topic
- api-security Declared skill tag
- owasp Declared skill tag
- mass-assignment Declared skill tag
- auto-binding Declared skill tag
- parameter-tampering Declared skill tag
- security Derived category
- data Derived category
- testing Derived category
- security-application Derived category
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Read excerpt
# Testing API for Mass Assignment Vulnerability
## When to Use
- Testing API endpoints that accept JSON/XML request bodies for user profile updates, registration, or object creation
- Assessing whether the API binds all client-supplied properties to the data model without an allowlist
- Evaluating if users can set privileged attributes (role, permissions, pricing, balance) through regular update endpoints
- Testing APIs built with ORMs that auto-bind request parameters to database models
- Validating that server-side input validation restricts writeable properties per user role
**Do not use** without written authorization. Mass assignment testing involves modifying object properties in potentially destructive ways.
## Prerequisites
- Written authorization specifying target API endpoints and scope