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performing-jwt-none-algorithm-attack

95 / 100 · Low risk

Fine to try.

By plurigrid/asi (GitHub) · other · 72 stars · scanned at commit 293ce9f

Execute and test the JWT none algorithm attack to bypass signature verification by manipulating the alg header field in JSON Web Tokens.

Works with any agent that supports SKILL.md skills.

What this skill can do

Install

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

if [ -e ~/.agents/skills/'performing-jwt-none-algorithm-attack' ] || [ -L ~/.agents/skills/'performing-jwt-none-algorithm-attack' ]; then echo 'A skill folder named performing-jwt-none-algorithm-attack already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/plurigrid/asi' "$d" && git -C "$d" checkout --quiet '293ce9f76e3abcd5ba18db284688bc0d9ac6691d' -- 'plugins/asi/skills/performing-jwt-none-algorithm-attack' && mkdir -p ~/.agents/skills && cp -R "$d"/'plugins/asi/skills/performing-jwt-none-algorithm-attack' ~/.agents/skills/'performing-jwt-none-algorithm-attack' && 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/'performing-jwt-none-algorithm-attack' ~/.claude/skills/'performing-jwt-none-algorithm-attack' (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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