How to Test Your Website Security: A Practical Guide for UK Business Owners

How to test your website security: a practical guide for UK business owners

Most business owners have no idea whether their website is secure. They assume their developer built it correctly, that hosting providers handle security, or that because nothing bad has happened, everything must be fine. None of these assumptions are reliable.

Testing your website security does not have to be complicated or expensive. There are things you can check yourself in the next ten minutes, and there are things that require proper automated testing — but the combination gives you a clear picture of where you stand.

What you can check yourself right now

SSL and HTTPS: type your domain into a browser and check that the address bar shows a padlock and begins with https://. Then type http:// before your domain and confirm you are automatically redirected to the https:// version. Go to ssllabs.com/ssltest and run a free SSL test — you should score A or A+.

Security headers: go to securityheaders.com, enter your domain, and check your score. You should see green ratings for Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Strict-Transport-Security, and Referrer-Policy. Missing headers are a finding you can give directly to your developer to fix.

Email authentication: go to mxtoolbox.com and check your SPF record, DKIM record, and DMARC record. All three should be present and correctly configured. Missing records mean anyone can send emails appearing to come from your domain.

Admin panel exposure: type your domain followed by /admin, /wp-admin, /administrator, and /login. If login pages appear that anyone can access from the internet, note them — they should ideally be restricted to specific IP addresses.

Software versions: if you use WordPress, go to your domain followed by /readme.html. If your WordPress version is visible, it is leaking information that helps attackers target known vulnerabilities.

Google Safe Browsing: go to transparencyreport.google.com/safe-browsing/search and enter your domain. If Google has flagged your site as dangerous, you have a serious problem that needs immediate attention.

What requires professional testing

The checks above tell you about surface-level security. They do not tell you whether your contact form can be used to extract your database, whether your login can be bypassed, whether your API exposes other users' data, or whether your session management has weaknesses.

These vulnerabilities require automated scanning tools that probe your live site with attack payloads and analyse the responses. A professional security test also checks for vulnerabilities in your specific configuration that generic checklists cannot detect.

The three-level approach

Level one — do the self-checks above. They are free and take less than an hour. Fix anything obvious.

Level two — run an automated security scan. Yrzo AI runs 44 automated checks against your live site in under 20 minutes, including SQL injection, XSS, IDOR, JWT attacks, CORS misconfigurations, and more. Starting at £399.

Level three — for businesses handling particularly sensitive data, supplement automated testing with a manual review of your most critical functionality. This is where traditional penetration testing adds value that automated tools cannot fully replicate.

Most UK small businesses need levels one and two. Level three is appropriate for businesses with complex applications, financial services companies, and organisations handling special category data under GDPR.