Website security only makes it onto most companies' agendas after something goes wrong: a hijacked contact form, a mail server that suddenly starts sending spam, or the browser's "This site is not secure" warning. Yet most of a corporate website's security comes down to a 10-point list that gets checked regularly. Here is the 2026 edition.
1. An SSL Certificate: Having One Isn't Enough
HTTPS is the standard now — but has the certificate expired, does it cover all subdomains, and does the site redirect automatically from http to https? Mixed content (http resources on an https page) triggers browser warnings and hurts your Google rankings.
2. Security Headers
The headers your server should send with every response are one-line configurations, but they make a real difference:
- HSTS — forces the browser to always use https
- X-Content-Type-Options: nosniff — blocks content-type spoofing
- X-Frame-Options / frame-ancestors — prevents your site from being embedded in an iframe on another site for "clickjacking"
- Content-Security-Policy — restricts which scripts are allowed to run
You can see your site's grade on securityheaders.com in 30 seconds.
3. Form Security: Spam and Injection
Contact and quote forms are the most-attacked part of any website. The bare minimum: server-side validation (not just in the browser), reCAPTCHA or similar bot protection, and sanitization of submitted data. Keeping your email address behind a form instead of publishing it as plain text on the page removes an open invitation to spam bots.
4. Up-to-Date Software, Closed Doors
- Are your CMS, theme, and plugins up to date? (Most attacks exploit old, well-known vulnerabilities)
- Have unused plugins and themes been deleted?
- Is your admin panel sitting at a predictable URL like /admin with unlimited login attempts? Is two-factor authentication (2FA) enabled?
5. KVKK Compliance: The Legal Side of Security
For every company operating in Turkey, KVKK (Turkey's data-protection law — the Turkish GDPR) requires:
| Requirement | What it means in practice |
|---|---|
| Privacy notice | Accessible next to your forms, kept up to date |
| Explicit consent | An opt-in checkbox for marketing emails (NOT pre-checked) |
| Cookie policy | Preference management for non-essential cookies |
| Data security measures | SSL, access control, a breach-notification process |
The penalties are serious: KVKK administrative fines can run to millions of lira.
6-10: Quick Checks
- Backups — automated, regular, and stored somewhere other than the server hosting the site
- Access management — does a former employee still have panel/FTP access?
- Error pages — do your error messages leak server or version information?
- Monitoring — when the site goes down, are you the first to know, or does a customer have to tell you?
- Dependency scanning — do the packages you use have known vulnerabilities? (Automate this with npm audit and similar tools)
Conclusion
Everything on this list can be closed out on an existing site with 1-2 days of technical work — a rounding error next to the cost of a security breach. At Senyo Labs, we apply these checks as part of the standard delivery scope on every project we build; you can also request a free security pre-check for your existing site.