Cookie のセキュリティ属性

重要な理由

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.

修正方法

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.

次のツールで確認

• 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).

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