claude-bughunter

A self-contained Claude skill bundle for bug hunting and external red-team work · 83 skills · 15 slash commands · 681 disclosed-report patterns (433 now individually cited & auditable) across 24 core vulnerability classes · enterprise identity + infrastructure attack matrices · engagement-folder scaffolding · Burp MCP integration · battle-tested across authorized red-team and bug-hunting engagements, plus public training platforms (DVWA, OWASP Juice Shop, Hacker101, testphp.vulnweb.com).

Built by Sachin Sharma — Bug Hunting & GenAI Security Research.

_{SPONSORED BY}
    

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What is this?

claude-bughunter is a drop-in skill bundle for the Claude Code skills system. Install once and Claude Code stops being a chatbot and starts behaving like a senior bug-hunting researcher or red-team operator: it knows the techniques, the chain templates, the VRT mappings, the platform CVE chains, and the hygiene — and it stays in scope.

Four layers stack:

• Think — bb-methodology + redteam-mindset: the 5-phase non-linear workflow, critical-thinking framework, and red-team operator discipline.
• Hunt webapps — 58 hunt-* skills curated from 681 disclosed HackerOne reports: per-class detection patterns, payloads, bypass tables, and chain templates.
• Hit the perimeter — enterprise platform chains (M365/Entra, Okta, vCenter, SSL-VPN appliances, SharePoint, cloud IAM): current 2024–2026 CVE chains + post-credential escalation.
• Ship it — triage-validation + reporting + evidence-hygiene: the 7-Question Gate, VRT-aware severity, OOS rebuttals, PII redaction, and red-team deliverables.

All triggered automatically by topic — describe what you're testing in plain English and the relevant skill loads. No invocation by name.

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Quickstart

Option A — install as a Claude Code plugin (recommended). From inside Claude Code:

/plugin marketplace add elementalsouls/Claude-BugHunter
/plugin install claude-bughunter@elementalsouls

All 83 skills + 15 commands load namespaced under claude-bughunter: and update when you bump the plugin version — no files copied into ~/.claude/.

Option B — copy install (no plugin system / pin to a clone):

git clone https://github.com/elementalsouls/Claude-BugHunter.git
cd Claude-BugHunter

# macOS / Linux
bash scripts/install.sh

# Windows (PowerShell)
pwsh ./scripts/install.ps1

Both copy the skills + commands into ~/.claude/ (macOS/Linux) or %USERPROFILE%\.claude\ (Windows) and wire the hunt engagement scaffolder.

What each install path gives you:

The plugin is the fastest path to the skills + slash commands. The terminal-native cbh runner installs standalone — pipx install git+https://github.com/elementalsouls/Claude-BugHunter — so plugin users can add it without a full clone (see cbh CLI). The hunt engagement scaffolder ships with the clone (Option B).

That's it. Open Claude Code and describe what you're testing in plain English — the right skill loads automatically, no invocation by name:

> Testing acme.com — an in-scope HackerOne target. Run recon and rank the surface.

  ⟳ loading skills: web2-recon, offensive-osint, bb-methodology …
    → subdomain enum (subfinder + crt.sh) … 47 hosts
    → live hosts (httpx) … 12 · tech fingerprint … 6 distinct stacks
    → ranked surface: api.acme.com (GraphQL, introspection ON)  ← start here
                      auth.acme.com (OAuth, SSO)               ← hunt-oauth

  Next: want me to probe the GraphQL introspection + OAuth redirect_uri?

→ Full Installation guide · Usage guide · searchable skill catalog.

The block above is an illustrative transcript. To record a real demo of your own session: asciinema rec demo.cast → upload to asciinema.org and drop the badge here.

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Runs on multiple agent harnesses

The skills are plain Agent Skills — the same SKILL.md format that Claude Code · OpenCode · OpenAI Codex CLI · Hermes Agent · Google AntiGravity all load. One command installs them everywhere:

# macOS / Linux
bash scripts/install.sh --all --burp-mcp

# Windows (PowerShell)
pwsh ./scripts/install.ps1 -All -BurpMcp

--all (-All) detects installed harnesses and copies skills to each harness's path (~/.claude/skills, ~/.agents/skills, ~/.hermes/skills, ~/.gemini/config/skills); --burp-mcp (-BurpMcp) wires the Burp MCP server into each. The full knowledge layer ports to all five — the slash commands and /hunt engine stay Claude-Code-only by design.

→ Multi-harness guide

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Star History

_{Chart is self-hosted — regenerate with python3 scripts/gen_star_history.py (needs gh auth login). Refreshes automatically each day via .github/workflows/star-history.yml.}

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Scope — what this bundle is for, and what it isn't

This bundle covers the external attack surface — anything reachable from the internet without first compromising an internal endpoint.

In scope

• Bug bounty hunting — web apps, APIs, SaaS, GraphQL, OAuth, JWT, file upload, IDOR, SSRF, RCE chains
• Web application pentesting — full hunt-* coverage of OWASP-mapped bug classes + discipline rules
• External red-team engagements — initial-access against internet-facing enterprise estate: M365 / Entra ID, Okta-as-IdP, SharePoint on-prem (ToolShell + legacy SOAP), VMware vCenter / Workspace ONE, SSL VPN appliances (Cisco / Fortinet / Citrix / Palo Alto / Pulse / SonicWall / F5), Android APK red-team, supply-chain recon
• Cloud misconfig + post-credential escalation — public S3, IMDS chains, STS AssumeRole, cross-account confused-deputy
• Recon + OSINT — subdomain enum, identity-fabric mapping, certificate transparency, JS analysis, secret scanning
• Reporting — H1, Bugcrowd (VRT-aware), Intigriti, Immunefi, plus client-facing red-team deliverable format

Out of scope (deliberate — not gaps, design decisions)

• Internal Active Directory attacks — BloodHound, Kerberoasting, ASREProast, DCSync, Pass-the-Hash, AD CS abuse, ntlmrelayx, Responder, PetitPotam, etc. Different operational risk profile; needs different tooling and judgment. Future bundle, not this one.
• C2 frameworks — Cobalt Strike, Sliver, Mythic, Havoc, BRC4 tradecraft. Out of scope for external-only engagement model.
• Post-exploit / persistence / lateral — Mimikatz/comsvcs LSASS dumping, golden/silver tickets, named-pipe impersonation, persistence (registry, scheduled tasks, WMI events, COM hijacking), token theft. These start after the perimeter has already broken — different bundle territory.
• Evasion — AMSI bypass, ETW patching, AV/EDR bypass. Tied to C2 tradecraft above.
• iOS pentesting / hardware / RF / ICS — out of scope by design.
• Binary exploitation / kernel pwn / browser internals — different skill universe.

If you're running an internal red team that includes domain-takeover chains via Kerberos or lateral movement, this bundle won't help you in those phases — and we'd rather say that up front than have you find out mid-engagement. The external surface handoff to internal-RT tooling (Impacket, NetExec, CrackMapExec, Rubeus, Certify, BloodHound) is intentionally outside our scope. Coverage for internal AD and post-exploit may come in a future update.

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What's inside

83 skills, auto-loaded by topic — no invocation by name. Coverage across the external attack surface:

Full searchable catalog → docs/skills.md. Also ships 15 slash commands (/hunt, /recon, /report, …) and a deterministic engagement engine (engine/) that maps a target's attack surface and routes each finding to the skill that handles it.

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How it works

A 6-phase, non-linear workflow — recon → map & rank → hunt → validate → report — with scope enforced in code and a 7-Question Gate before anything is submitted. Two ways to drive it:

• Plain English — describe what you're testing and the relevant skill loads automatically.
• /hunt scaffold + cbh CLI — engagement-folder structure, state, and orchestration.

→ Usage guide & worked example · 6-phase architecture & skill-to-phase map · cbh CLI

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Authorization

These skills are intended for assets you own or have written authorization to assess (bug-bounty in-scope assets, pentest engagement letters, CTF challenges, your own infrastructure).

The skills include validation gates that auto-trigger when you point Claude at unverified third-party targets — triage-validation's 7-Question Gate explicitly asks whether the asset is in scope (Q3) and on the program's accepted-impact list (Q2). The bugcrowd-reporting skill includes researcher-side hygiene (Bugcrowdninja alias, account-state restoration, friendly-tester posture) that signals legitimate authorized testing to the target's fraud team.

The bundle explicitly excludes: weaponizing 0-days against unauthorized targets, post-exploitation tooling, malware development, mass-targeting infrastructure. See SECURITY.md for the full posture.

Heads-up — Anthropic runtime cyber safeguards. Anthropic's models apply real-time safeguards that block "vulnerability exploitation or offensive security tooling development" by default — so even authorized, in-scope work can hit a refusal that isn't this bundle's doing. If you do authorized offensive security (pentest / bug bounty / red team), enroll in Anthropic's free, application-based Cyber Verification Program (CVP) to get safeguards adjusted for legitimate dual-use work. (Mass data exfiltration and ransomware development stay prohibited and are not adjustable.) Details: Anthropic — real-time cyber safeguards.

Why your model switched mid-session

Separate from refusals, and easy to miss. On Opus 5, a narrow set of higher-risk cyber requests — Anthropic names exploit generation, binary-based vulnerability scanning and penetration testing — fall back to Opus 4.8 rather than being refused. You get a notice and the response is labelled with the model that answered, but in a long agentic run that is easy to scroll past, so it can look like Opus 5 quietly got worse. See why Claude switched models.

What to do depends on what you are actually doing:

/hunt states the engagement frame (authorized, scope-bounded, remediable finding) on its first turn for exactly this reason — engagement context belongs in the session explicitly, not implied.

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Documentation

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Why this exists

Most bug-hunting Claude setups are either too generic (one big "security" prompt) or too fragmented (you bookmark 30 disclosed reports and re-read them every engagement). Neither scales past the second target.

This bundle was built and validated through authorized engagements that exposed different capability gaps:

Bug-bounty engagement — surfaced four gaps a starter 3-skill stack could not close:

1. No hypothesis discipline — drafts written before validation → wasted hours, hurt validity ratio
2. No per-program reporting tactics — VRT defaults auto-downgraded P3-worthy findings to P4
3. No engagement coordination — findings, evidence, and submission IDs scattered across folders
4. No evidence hygiene — screenshots leaked cookies and victim PII

External red-team engagement — exposed five additional gaps that bug-bounty defaults made worse:

1. Conservative defaults retracted real findings — WAPT mindset stopped tests early on defended targets where red-team continuation would have surfaced bypass chains → redteam-mindset
2. No mid-engagement situational awareness — client SOC patched confirmed SQLi within 30 min; external attacker locked 14 accounts during a live test session — both invisible without explicit detection methodology → mid-engagement-ir-detection
3. No enterprise-platform attack chains — M365 + Entra ID, on-prem SharePoint, Cisco SSL VPN, vCenter, and 7 Android APKs all needed current 2024-2026 CVE knowledge and platform-specific tradecraft → m365-entra-attack, okta-attack, hunt-sharepoint, hunt-aspnet, hunt-ntlm-info, vmware-vcenter-attack, enterprise-vpn-attack, apk-redteam-pipeline
4. No client-facing deliverable format — bug-bounty report templates don't fit enterprise red-team where output is a 50KB+ MD + DOCX with embedded screenshots → redteam-report-template
5. No post-credential escalation model — when recon yielded credentials (AWS keys, JWTs, GCP JSON), it was unclear what they granted or how to escalate → cloud-iam-deep

The per-class hunt-* skills address gap-zero ("what should I look for in webapps") — the original 24 codifying patterns from 681 disclosed HackerOne reports, with 20+ framework/surface skills added by the community v3 expansion — Claude knows the actual chain templates real triagers paid for, not abstract OWASP Top 10. The enterprise-platform and red-team-tradecraft layers address what bug-bounty alone cannot: external red-team engagements against monitored enterprise targets.

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Roadmap

• HackerOne MCP integration (currently only Burp MCP wired in)
• Per-engagement memory layer — pattern recall across targets
• Industry-specific hunt skills — hunt-fintech-graphql shipped; hunt-healthcare-fhir, hunt-gov-compliance still open
• Program-rules-parser skill — auto-generate structured scope.md from program text
• Refresh hunt-* skills with newer disclosed reports (re-run public-skills-builder)
• Additional enterprise-platform skills — citrix-netscaler-deep, f5-bigip-attack, ad-cs-attack (AD Certificate Services)
• Refresh enterprise-VPN CVE matrix quarterly to track 2026 advisories
• Update architecture SVG to include the 7-skill enterprise-platform layer

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Sponsors

ApiSmart unifies leading LLM, image, and video models through one OpenAI-compatible API. Use one key to switch models, simplify billing, and improve reliability with automatic failover.

ThreatWatch360 is an AI-powered offensive-security platform: continuous Attack Surface Management, AI-assisted penetration testing, brand protection, dark-web monitoring, and Cyber Threat Intelligence in one platform. Validated findings with proof-of-concept and business-impact prioritization — signal over alert fatigue.

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About

Operational tradecraft accumulated across bug-bounty engagements and authorized pentests, codified into Claude skills. Platform-agnostic — slot into any engagement workflow you already use, or none.

Author: ElementalSoul · GenAI Security Research

Sister project: Claude-OSINT — paired skills for the recon phase that this bundle picks up after. Its two recon skills (offensive-osint, osint-methodology) are canonically maintained here and re-exported there, so the two are byte-identical. Installing both is safe: each bundle's installer (install.sh on macOS/Linux, install.ps1 on Windows) records a manifest, the script skips re-copying an identical skill, and --uninstall keeps any skill the other bundle still owns — uninstalling one never breaks the other.

Vendored foundation: shuvonsec/claude-bug-bounty — methodology, validation, reporting, payload library (8 of 83 skills + 15 slash commands)

Generator tool used (not vendored): shuvonsec/public-skills-builder — used to scaffold per-class skills from H1 disclosed reports

Inspirations:

• archangel / douglasday — top-10 H1 hunter; per-class skill pattern
• Trail of Bits — trailofbits/skills — skill-authoring discipline
• SecSkills — trilwu/secskills — subagent pattern

Tool inventory:

• PortSwigger Burp Suite + MCP Server extension
• ProjectDiscovery — subfinder · dnsx · httpx · katana · nuclei
• SecLists · Assetnote Wordlists

License

This project is dual-licensed:

• Code (Python helpers, shell scripts) — MIT.
• Content (skill methodology, wordlists, regex catalogs, severity rubrics, docs) — Creative Commons Attribution 4.0 International (CC BY 4.0).

To be precise about the boundary: *.py, *.sh, and other source files are MIT; *.md documentation, wordlists, regex catalogs, and rubrics are CC BY 4.0.

Reuse the content freely — including commercially — as long as you credit Sachin Sharma / Claude-BugHunter and link back to this repository. See NOTICE for upstream-skills attribution.

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"Give Claude the right skill and it stops being a chatbot. It becomes an operator."