Vulnerability Classes

by H-mmer

Vulnerability Classes is a Quality skill for Claude Code, published by H-mmer in pentest-agents.

804 stars156 forkson H-mmer/pentest-agentsAdded 2026/08/22Repository updated 2026/06/12

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agentsbug-bountybugcrowdclaude-codehackeronemcppentestingsecurity-tools

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Install Vulnerability Classes

Copy Vulnerability Classes 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/H-mmer/pentest-agents/tree/main/skills/vuln-classes ~/.claude/skills/vuln-classes

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/H-mmer/pentest-agents.git

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

In this catalog

Source file: skills/vuln-classes/SKILL.md in H-mmer/pentest-agents
Installs to: ~/.claude/skills/vuln-classes
Collection: One of 25 skills cataloged from this repository
Category: Quality — 1354 skills

What Vulnerability Classes does

Vulnerability Classes provides testing patterns for common web application flaws such as IDOR, SSRF, XSS, auth bypass, GraphQL, OAuth, race conditions, and file upload issues. Use it when validating security controls or triaging suspected bugs.

Vulnerability Classes is cataloged under Quality on DirSkills. Vulnerability Classes comes from a repository tagged agents, bug-bounty, bugcrowd, claude-code and hackerone.

Documentation

README

Excerpt

Vulnerability Classes — Testing Playbook

IDOR (Insecure Direct Object Reference)

Setup: Two accounts (attacker + victim). Log in as both.

Test pattern:

Perform action as victim → note all IDs in requests
Replay same request with attacker's token + victim's IDs
If data returned → IDOR confirmed

Expand:

Test GET, PUT, DELETE on same endpoint
Test ALL sibling endpoints (export, share, archive, download, history)
Test /api/v1/ if /api/v2/ is protected (version downgrade)
Test without auth header entirely
Test numeric ID +1, -1, 0
Test GraphQL node(id: "base64") queries

Kill signals: All endpoints return 403 with wrong ID, UUIDs without enumeration path.

Auth Bypass

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

Commands Vulnerability Classes provides

Slash commands named in this skill’s SKILL.md, listed in the order they first appear.

/graphql

Frequently asked about Vulnerability Classes

What else does H-mmer publish alongside Vulnerability Classes?
Vulnerability Classes is one of 25 skills that DirSkills catalogs from H-mmer/pentest-agents, the repository it ships in. Its siblings there include Analyze, Autopilot and Brain. Each one is a separate skill with its own page in this directory, installs the same way Vulnerability Classes does, and is maintained by H-mmer in that same repository. The rest of the collection is listed on the H-mmer/pentest-agents page.
How does Vulnerability Classes compare to other Quality skills?
Vulnerability Classes ranks #970 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 Vulnerability Classes against them. Open each page to compare what they document and how they install.