Cookie Security Guide: HttpOnly, Secure, SameSite, and More
Every cookie security attribute explained: what each flag does, when to use it, and the right defaults for authentication cookies.
Published:
Tags: security, cookies, web
Cookie Security: HttpOnly, Secure, SameSite, and Domain Cookies are the most common mechanism for maintaining state in web applications — and one of the most frequently misconfigured. A cookie without the right security attributes is a session waiting to be hijacked, a CSRF attack waiting to land, or a cross-subdomain credential leak. This guide covers every security-relevant cookie attribute and when to use each. The Set-Cookie Header Every cookie attribute is set via the response header. A fully secured session cookie looks like this: Breaking down each attribute: HttpOnly prevents client-side JavaScript from accessing the cookie via . This is the primary defense against XSS-based session theft. Without : With , simply does not include the protected cookie. It is still sent by the…
All articles · theproductguy.in