fix(core)!: Enforce a sandbox CSP on webhook endpoints #9875
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Summary
If a webhook endpoint is used to serve an HTML file, it could be used for XSS.
This is not a supported feature, and to prevent this exploit, we should set CSP header to sandbox the entire page.
Related Linear tickets, Github issues, and Community forum posts
https://linear.app/n8n/issue/SEC-54
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