Mass Assignment Testing

Mass Assignment Testing is a Quality skill for Claude Code, published by xalgord in xalgorix.

852 stars153 forkson xalgord/xalgorixAdded 2026/08/12+1% in starsRepository updated 2026/08/11

ai-agentai-securityautomationautonomous-pentestingbug-bountycybersecurityethical-hackinggolangpenetration-testingpentestpentesting-toolsreconsecuritysecurity-researchsecurity-toolstypescriptvulnerability-detectionvulnerability-scanner

Install in seconds

Install Mass Assignment Testing

Copy Mass Assignment Testing into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/xalgorix/xalgorix/tree/main/internal/tools/skills/data/api-security/testing-api-for-mass-assignment-vulnerability ~/.claude/skills/testing-api-for-mass-assignment-vulnerability

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/xalgorix/xalgorix.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: internal/tools/skills/data/api-security/testing-api-for-mass-assignment-vulnerability/SKILL.md in xalgord/xalgorix
Installs to: ~/.claude/skills/testing-api-for-mass-assignment-vulnerability
Collection: One of 51 skills cataloged from this repository
Category: Quality — 1354 skills

What Mass Assignment Testing does

Mass Assignment Testing checks API endpoints for mass assignment flaws where extra client-supplied fields can change privileged object properties. Use it to verify whether create, update, and nested payloads let users set roles, status, balance, or similar fields.

Mass Assignment Testing is cataloged under Quality on DirSkills. Mass Assignment Testing comes from a repository tagged ai-agent, ai-security, automation, autonomous-pentesting and bug-bounty.

Documentation

README

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.

Most Often Missed & How to Confirm

This is the opening of the README. Read the full README on GitHub.

Frequently asked about Mass Assignment Testing

What else does xalgord publish alongside Mass Assignment Testing?
Mass Assignment Testing is one of 51 skills that DirSkills catalogs from xalgord/xalgorix, the repository it ships in. Its siblings there include AFL++ Fuzzing, AI Security Guardrails and AI-Assisted Vulnerability Discovery. Each one is a separate skill with its own page in this directory, installs the same way Mass Assignment Testing does, and is maintained by xalgord in that same repository. The rest of the collection is listed on the xalgord/xalgorix page.
How does Mass Assignment Testing compare to other Quality skills?
Mass Assignment Testing ranks #931 by stars among the 1354 Quality skills in this catalog. The most-starred ones next to it are Benchmark, Benchmark Optimization Loop and API Design Patterns. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Mass Assignment Testing against them. Open each page to compare what they document and how they install.