Individual skill

cors

CORS misconfiguration exploitation — reflected origin, null origin, trusted-subdomain abuse, regex-validation bypass, and credentialed cross-origin data theft.

packages/decepticon/decepticon/skills/standard/exploit/web/cors/SKILL.md

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Observed behavior: Network or broad shell
Last checked: Nov 9, 2026

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Repository stars (not skill ratings): 6,568
Repository last updated: Nov 7, 2026
License: Apache-2.0

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langchain Repository topic
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llm Repository topic
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pentesting Repository topic
pentest Repository topic
web-application,-cors,-origin,-cross-origin,-data-exfiltration Declared skill tag
data Derived category

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SKILL.mdcore · 4,851 bytes
SKILL.mdcore · 4,851 bytes
SKILL.mdcore · 4,851 bytes

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# CORS Misconfiguration Playbook

A permissive `Access-Control-Allow-Origin` (ACAO) becomes critical the moment it
is paired with `Access-Control-Allow-Credentials: true` (ACAC) — any origin the
server reflects can read authenticated responses (PII, API keys, CSRF tokens).
ACAO alone (no credentials) is usually Low unless the endpoint serves secrets to
unauthenticated requests.

## 1. Detection — probe origin reflection
```bash
# Reflected-origin + credentials = the critical case
for o in "https://evil.com" "null" "https://<TARGET>.evil.com" "https://evil.com.<TARGET>"; do
  echo "== Origin: $o =="
  curl -s -D- -o /dev/null "https://<TARGET>/api/account" -H "Origin: $o" \