10 Website Security Mistakes UK Businesses Make (And How to Fix Them)

Cyber security isn’t just for large enterprises. In 2025 alone, UK small and medium-sized businesses faced a 32% increase in cyber attacks, with the average cost of a breach reaching £15,000 for an SME. The good news? Most of these attacks could have been prevented with basic security hygiene.

Here are the ten most common website security mistakes we see UK businesses make — and how to fix them.

1. Using Default or Weak Passwords

It’s 2026 and yet “admin:admin” is still one of the most common login combinations we find. Use a password manager and enforce strong password policies across your entire organisation.

2. Neglecting Software Updates

Every day you delay a security patch is a day your site is vulnerable. Enable automatic updates where possible and schedule regular maintenance windows for manual updates.

3. Missing SSL/TLS Certificates

If your site doesn’t have a valid SSL certificate, browsers will flag it as “Not Secure”. Beyond trust, HTTPS is now a ranking factor for Google and a requirement for PCI DSS compliance.

4. No Web Application Firewall (WAF)

A WAF filters malicious traffic before it reaches your server. It’s one of the most cost-effective security measures you can implement.

5. Exposed Admin Panels

Your admin login should never be at /admin. Use a custom URL, implement IP whitelisting, and enforce two-factor authentication.

6. Lack of Regular Backups

Ransomware attacks are on the rise. Maintain automated, encrypted backups with a tested restore process.

7. Overly Permissive User Roles

Follow the principle of least privilege: every user should only have access to what they need to do their job.

8. No Content Security Policy (CSP)

A CSP header tells the browser which sources are allowed to load content on your site, mitigating XSS attacks.

9. Exposing Sensitive Data in Logs

Never log passwords, API keys, or personal data. Implement structured logging with automatic redaction.

10. No Security Headers

In addition to CSP, implement HSTS, X-Frame-Options, and X-Content-Type-Options headers for a basic security baseline.

Need help auditing your website security? We offer comprehensive security assessments tailored for UK businesses.