Insecurely Scoped Cookie

Anandhu Krishnan
Published on
14 May 2024


Cookies can be scoped by domain or path, but this vulnerability check only looks at domain scope. The domain scope applied to a cookie determines which domains can access it. For instance, cookies can be strictly scoped to a subdomain like or loosely scoped to a parent domain like This means any subdomain of can access the cookie. Loosely scoped cookies are commonly used in large applications.


Scope all cookies to a Fully Qualified Domain Name (FQDN) and ensure they cannot be accessed by unauthorized domains.

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Written by
Anandhu Krishnan
Anandhu Krishnan
Lead Engineer
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