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testing-for-email-header-injection

90 / 100 · Low risk

Fine to try. Some of what it can do is expected: a productivity skill usually connects to your mail, calendar or notes.

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

Test web application email functionality for SMTP header injection vulnerabilities that allow attackers to inject additional email headers, modify recipients, and abuse contact forms for spam relay.

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/'testing-for-email-header-injection' ] || [ -L ~/.agents/skills/'testing-for-email-header-injection' ]; then echo 'A skill folder named testing-for-email-header-injection 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 "$d" checkout --quiet '293ce9f76e3abcd5ba18db284688bc0d9ac6691d' -- 'plugins/asi/skills/testing-for-email-header-injection' && mkdir -p ~/.agents/skills && cp -R "$d"/'plugins/asi/skills/testing-for-email-header-injection' ~/.agents/skills/'testing-for-email-header-injection' && 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/'testing-for-email-header-injection' ~/.claude/skills/'testing-for-email-header-injection' (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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