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Add offensive-cors skill (CORS misconfiguration exploitation) - #41
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Single-skill change against main. Origin reflection, null origin, allowlist flaws, credentialed fetch PoC, defender view. README, CHANGELOG, and claude-skills.json updated for this skill only.
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Adds
offensive-corsunderweb.Coverage: credentialed cross-origin data theft via
Access-Control-Allow-Originreflection +Access-Control-Allow-Credentials: true;nullorigin abuse via sandboxed iframe/data:; the full allowlist-logic flaw taxonomy (unescaped-regex dots, prefix/suffix/substring matches, sibling-domain tricks,http://scheme downgrade, trust-all-subdomains → subdomain-XSS pivot); probing with curl/Burp/CORScanner/Corsy; a weaponizedfetch(url,{credentials:'include'})exfiltration PoC with preflight handling;Vary: Origincache interplay; and the defender view with correct config.Follows the SKILL.md format with Key References to PortSwigger, OWASP, CWE-942, CWE-346.
example.com/RFC5737 only. README, CHANGELOG, andclaude-skills.jsonupdated viatools/build_manifest.py.Made with Cursor