Cookie security flags

Why it matters

Cookies without the Secure, HttpOnly and SameSite flags can be sent over insecure connections, read by injected scripts or attached to cross-site requests. Session cookies are the most sensitive.

How to fix it

1. Add Secure so the cookie is only sent over HTTPS.
2. Add HttpOnly to every cookie that JavaScript does not need to read.
3. Add SameSite=Lax (or Strict) to reduce cross-site request forgery.

Check it with

• HTTP Headers Checker – View all HTTP response headers for a URL, with notes on the ones that matter for SEO.
• Security Headers Checker – Grade a site’s HTTP security headers (CSP, HSTS, X-Frame-Options and more).

Scoring: a passed check earns its full weight, a warning half and an error none. How the SEO score works

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