Individual skill
testing-cors-misconfiguration
Identifying and exploiting Cross-Origin Resource Sharing misconfigurations that allow unauthorized cross-domain data access and credential theft during security assessments.
internal/tools/skills/data/web-application-security/testing-cors-misconfiguration/SKILL.md
Source commit d42f381ad34843e71a42658e5c57290c713e85af
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- Last checked
- Nov 9, 2026
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- Repository last updated
- Nov 8, 2026
- License
- Apache-2.0
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- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- penetration-testing Declared skill tag
- cors Declared skill tag
- web-security Declared skill tag
- owasp Declared skill tag
- same-origin-policy Declared skill tag
- burpsuite Declared skill tag
- data Derived category
- security Derived category
- testing Derived category
- security-application Derived category
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# Testing CORS Misconfiguration
## When to Use
- During authorized penetration tests when assessing API endpoints for cross-origin access controls
- When testing single-page applications that make cross-origin API requests
- For evaluating whether sensitive data can be exfiltrated from a victim's browser session
- When assessing microservice architectures with multiple domains sharing data
- During security audits of applications using CORS headers for cross-domain communication
## How to CONFIRM a Hit (avoid false negatives)
A high-impact CORS hit is confirmed only when the response **reflects your attacker Origin in `Access-Control-Allow-Origin` AND returns `Access-Control-Allow-Credentials: true`** — together these let an attacker page read authenticated responses cross-origin:
