Security headers for letsencrypt.org

Security headers summary for letsencrypt.org

This page validates the HTTP security headers returned by letsencrypt.org, scoring its protection against common web attacks.

Below you can review which headers letsencrypt.org sends, which are missing, and recommendations to harden the configuration.

What are HTTP security headers?

HTTP security headers are response headers that instruct the browser to apply protective policies, mitigating attacks such as XSS, clickjacking and content sniffing.

Key headers include Content-Security-Policy (CSP), Strict-Transport-Security (HSTS), X-Frame-Options, X-Content-Type-Options and Referrer-Policy.

How to interpret the headers of letsencrypt.org

A higher score means letsencrypt.org sends more of the recommended security headers with secure values. Missing headers are highlighted so you know what to add.

Focus first on CSP and HSTS for letsencrypt.org, as they provide the strongest protection against scripting and downgrade attacks.

Use cases

  • Audit the security headers of letsencrypt.org before or after a deploy.
  • Identify missing headers that increase attack risk on letsencrypt.org.
  • Verify that letsencrypt.org enforces HTTPS with HSTS.
  • Support hardening reports and security reviews for letsencrypt.org.

Frequently asked questions

Which security headers does letsencrypt.org use?

This page lists the HTTP security headers present on letsencrypt.org, such as CSP, HSTS, X-Frame-Options and X-Content-Type-Options, along with their values.

Does letsencrypt.org have a Content-Security-Policy?

The results show whether letsencrypt.org sends a Content-Security-Policy header and whether its value is considered secure.

Does letsencrypt.org enforce HTTPS with HSTS?

The Strict-Transport-Security section indicates whether letsencrypt.org forces HTTPS and for how long, including includeSubDomains and preload flags.

Why does letsencrypt.org have a low security score?

A low score means letsencrypt.org is missing important headers or sends insecure values. The missing-headers and recommendations sections explain how to improve it.

Is the security headers check for letsencrypt.org free?

Yes. The XploreNetHub Security Headers Validator is completely free, requires no sign-up and runs directly in your browser.

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