01 Lighthouse: More Than Speed
Google Lighthouse is the gold standard for measuring website quality, but its security features are often overlooked. Improving your security score in Lighthouse isn't just about obtaining a high percentage; it's about protecting your users from real-world attacks like session hijacking and data theft.
Visibility
See exactly which scripts and links are insecure.
SEO Impact
Security is a ranking factor. Passing Lighthouse checks helps you rank higher.
02 What Lighthouse Actually Checks
When you run a Lighthouse audit, several security-critical items are evaluated:
Uses HTTPS
Ensures that all communication between the browser and server is encrypted. Non-HTTPS sites are flagged as 'Not Secure' by Google.
Avoids Insecure Cross-Origin Links
Checks that links to other sites use `rel="noopener"` or `rel="noreferrer"` to prevent the destination page from having access to your page's context.
Prevents Password Pasting (Accessibility)
While an accessibility check, ensuring users can use their password managers is a key part of good security hygiene.
03 Detecting Vulnerable JS Libraries
One of the most powerful security features in Lighthouse is its link to the **Snyk vulnerability database**. Lighthouse scans your site's JavaScript files and compares them against a list of known vulnerable versions.
If you're using an outdated version of jQuery, React, or Lodash that has a known XSS (Cross-Site Scripting) vulnerability, Lighthouse will tell you exactly which file it is and how to fix it.
04 Beyond the Lighthouse Score
A high Lighthouse score is a great start, but it's only a partial picture. To truly secure your site, you must go beyond the automated browser checks:
Content Security Policy (CSP)
Lighthouse barely touches CSP. You need a robust policy to stop modern XSS attacks.
Strict DNS Records
Lighthouse can't see your SPF or DMARC records. These are critical for preventing domain spoofing.
05 Frequently Asked Questions
Does a 100/100 Lighthouse score mean my site is unhackable?
No. Lighthouse checks for 'Best Practices' and common misconfigurations (like HTTPS or insecure cross-origin links). It does not test for complex logic flaws, server-side vulnerabilities, or zero-day exploits.
Can Lighthouse detect SQL Injection?
No. Lighthouse is a front-end auditing tool. It cannot see your database logic or server-side code. For that, you need a full vulnerability scanner like LamaniSecure.
Why does Lighthouse flag my third-party scripts?
Lighthouse checks if your scripts are being served over HTTPS and if they contain known security vulnerabilities. If a library like an old version of jQuery is detected, it will flag it as a risk.
Get a 360° security audit
We combine Lighthouse best practices with 25+ advanced security checks.
Score My Site Now