Individual skill
x-frame-options
Use when reviewing HTTP response headers for clickjacking protection on any web application with authenticated user actions.
skills/x-frame-options/SKILL.md
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# Set an X-Frame-Options header
Without framing protection, an attacker can embed your banking login page in a transparent iframe on a malicious site and trick users into clicking buttons they cannot see — transferring money, changing settings, or leaking credentials.
## Quick Reference
- Use `X-Frame-Options: DENY` to prevent all framing, or `SAMEORIGIN` to allow framing only from your own domain
- `ALLOWFROM` is obsolete and unsupported in modern browsers — use CSP `frame-ancestors` instead
- The modern equivalent is `Content-Security-Policy: frame-ancestors 'none'` — prefer CSP for new sites
- Both headers can coexist: X-Frame-Options for older browsers, frame-ancestors for modern ones
- Clickjacking attacks trick users into clicking invisible iframe buttons — DENY eliminates this entirely
## Check
