update SECURITY.md

SECURITY.md

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 If you come across any security concern or vulnarability, please report the information via email to security@docuseal.co instead of opening a GitHub issue. We will promptly respond and will collaborate with you to validate the issue, and resolve it ASAP.
 
 **We have a bug bounty program to reward security researchers.**
+
+Out of scope vulnerabilities:
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+- CSRF
+- DNSSEC, CAA, CSP headers
+- DNS or email security related
+- Rate Limiting
+
+Note: We reserve the right to classify any reported vulnerability as out of scope for the bug bounty program.