Security Scanning

How Website Security Checks Work

Modern website security checkers run dozens of tests in parallel and aggregate the results into a single score. This guide explains what each test actually does so you can interpret results, prioritize fixes, and avoid wasting time on cosmetic warnings.

SSL/TLS validation

The check verifies the certificate is valid, not expired, signed by a trusted root, matches the hostname, and supports modern protocols (TLS 1.2 and 1.3). It also flags weak ciphers, missing intermediate certificates, and mixed-content references to insecure resources.

DNS security

DNS checks look for: DNSSEC signing, CAA records restricting which CAs can issue certificates, SPF/DKIM/DMARC for email authentication, and no dangling CNAMEs that could be hijacked by a previous tenant of an abandoned subdomain.

Blacklist and reputation lookups

Your domain and IP are checked against major blocklists (Spamhaus, SURBL, SORBS, Google Safe Browsing, Microsoft SmartScreen). A clean record means email is more likely to deliver and browsers won't warn visitors away.

Malware and content scanning

Scanners fetch the homepage and key URLs, compare against known-malicious signatures, and look for suspicious injected scripts, hidden iframes, and cryptominer payloads. They cannot scan files you don't expose publicly — server-side antivirus is a separate layer.

Security scoring methodology

Most scoring systems weight findings by impact: a missing HSTS header is low-medium, an expired certificate is critical. Don't chase 100/100. Focus on critical and high findings, accept some medium ones with documented justification, and skip informational items unless they're trivial to fix.

Recommended next steps

Diagnostic workflow

1
Check SSL health
Verify certificate validity, chain, and expiry.
SSL check
2
Verify DNS configuration
Look at records, security flags, and propagation.
DNS lookup
3
Run blacklist check
Confirm your IP isn't on email or browser blocklists.
Blacklist check
4
Walk the security checklist
Cover the remaining configuration items end-to-end.
Security checklist

Frequently asked questions

What does a website security check actually do?

It runs a battery of read-only tests — SSL certificate validity, DNS configuration, blacklist lookups, header analysis, and known-malware signatures — then aggregates the results into a score with specific remediations.

Is a perfect security score necessary?

No. Some headers and configurations matter much more than others. Aim to clear all 'critical' and 'high' findings; 'low' and 'informational' items are nice-to-have but rarely the difference between safe and compromised.

Why does my site appear on a blacklist?

Most commonly: a shared IP where another tenant sent spam, a compromised plugin sending malicious content, or stale references to your domain in attack tooling. Many blacklists offer self-service delisting once the underlying cause is fixed.

Do security headers really help?

Yes. Strict-Transport-Security, Content-Security-Policy, and X-Frame-Options block entire classes of attacks (downgrade, XSS, clickjacking) with minimal effort to configure.

How often should I scan my site?

Weekly automated checks plus a deep scan after any major change (new theme, plugin update, redesign). Continuous monitoring catches issues introduced by third-party scripts you don't directly control.