offensive-jwt

92 / 100 · Low risk

Fine to try. Some of what it can do is expected: a coding skill usually runs build and test commands.

By SnailSploit/Claude-Red (GitHub) · coding · 10,590 stars · scanned at commit a8de813

JWT attack methodology for penetration testers. Covers algorithm confusion (alg:none, RS256→HS256), weak HMAC secret brute force, kid parameter injection (SQLi, path traversal), jku/x5u/jwk header injection, JWKS cache poisoning, JWS/JWE confusion, timing attacks, and mobile JWT storage extraction. Use when testing JWT-based authentication, hunting auth bypass via token manipulation, or evaluating JWT implementation security in web or mobile apps.

Works with any agent that supports SKILL.md skills.

What this skill can do

Runs commands on your computer

The author does not mention this. Expected for a coding skill.

Found in 5 places.

Skills/auth/offensive-jwt/SKILL.md, line 126adb shell "run-as com.target.app cat /data/data/com.target.app/shared_prefs/auth.xml"
Skills/auth/offensive-jwt/SKILL.md, line 142curl -H "Authorization: Bearer <api_key>" https://api.target/resource
Skills/auth/offensive-jwt/SKILL.md, line 173curl "https://api.target/resource?token=eyJ..."

Show 2 more

Skills/auth/offensive-jwt/SKILL.md, line 222python3 jwt_tool.py <token> -C -d wordlist.txt
Skills/auth/offensive-jwt/SKILL.md, line 234python3 jwt_tool.py <token>

Sends data to these websites: api.target, target

This is disclosed by the author in the skill's SKILL.md or README.

Found in 6 places.

Skills/auth/offensive-jwt/SKILL.md, line 142curl -H "Authorization: Bearer <api_key>" https://api.target/resource
Skills/auth/offensive-jwt/SKILL.md, line 145curl -H "X-API-Key: <jwt_token>" https://api.target/resource
Skills/auth/offensive-jwt/SKILL.md, line 157r = requests.get('https://target/api',

Show 3 more

Skills/auth/offensive-jwt/SKILL.md, line 173curl "https://api.target/resource?token=eyJ..."
Skills/auth/offensive-jwt/SKILL.md, line 174curl "https://api.target/resource?access_token=eyJ..."
Skills/auth/offensive-jwt/SKILL.md, line 175curl "https://api.target/resource?jwt=eyJ..."

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'offensive-jwt' ] || [ -L ~/.agents/skills/'offensive-jwt' ]; then echo 'A skill folder named offensive-jwt already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/SnailSploit/Claude-Red' "$d" && git -C "$d" checkout --quiet 'a8de813edc9f66f60d44cfe42d47750e89d9930b' -- 'Skills/auth/offensive-jwt' && mkdir -p ~/.agents/skills && cp -R "$d"/'Skills/auth/offensive-jwt' ~/.agents/skills/'offensive-jwt' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'offensive-jwt' ~/.claude/skills/'offensive-jwt' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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Score history

Date	Version	Score
2026-11-08	`a8de813`	92
2026-11-07	`a8de813`	92