If you want to know how to check website security, the answer is more than just looking for a padlock icon.
A credible security check combines browser signals, server configuration, software hygiene, and vulnerability testing.
This guide shows a practical process you can use on your own site or when evaluating another website’s safety.
You will learn what to inspect, which tools matter, and which warning signs usually indicate real risk.
What website security checking actually covers
Website security is the combination of controls that protect a site, its visitors, and its data.
A meaningful review looks at transport security, application security, access control, content integrity, and the resilience of the underlying hosting environment.
When people search for how to check website security, they often mean a few different things:
- Is the connection encrypted with HTTPS?
- Does the site expose outdated software or known vulnerabilities?
- Are forms, logins, and payments protected?
- Are security headers and cookie settings configured correctly?
- Is the site monitored for malware, defacement, or unauthorized changes?
Each layer matters because attackers usually look for the weakest one.
A site can have a valid SSL/TLS certificate and still be vulnerable if its CMS, plugins, or server settings are outdated.
Start with a quick visual and browser-level check
The fastest first pass is the browser itself.
Open the site in Chrome, Firefox, or Safari and review the address bar, certificate status, and any browser warnings.
Look for HTTPS and certificate validity
A secure site should load over HTTPS, not plain HTTP.
Click the padlock or site info icon to view the certificate details, including the issuing Certificate Authority, expiration date, and the domain names covered by the certificate.
Important checks include:
- The certificate is valid and not expired.
- The certificate matches the exact domain or subdomain.
- The site does not trigger browser warnings about mixed content or insecure forms.
Watch for mixed content
Mixed content happens when the page loads over HTTPS but requests images, scripts, styles, or fonts over HTTP.
Even one insecure asset can weaken trust and create a foothold for content injection.
Modern browsers often block active mixed content such as JavaScript, but passive mixed content can still indicate poor site hygiene.
A security-conscious site should eliminate both.
Check the SSL/TLS configuration beyond the padlock
SSL/TLS is essential, but a padlock alone does not guarantee strong encryption.
A better review checks protocol support, cipher strength, certificate chain validity, and whether the server has deprecated versions enabled.
Useful checks include:
- Whether the server supports TLS 1.2 and TLS 1.3.
- Whether weak protocols like SSL 3.0, TLS 1.0, or TLS 1.1 are disabled.
- Whether the certificate chain is complete and trusted.
- Whether the site uses HTTP Strict Transport Security, also known as HSTS.
Tools such as Qualys SSL Labs can score a site’s TLS setup and identify common mistakes.
For a public-facing site, a strong result typically means modern protocols, valid certificates, and no obvious downgrade paths.
Review security headers and cookie settings
Security headers help browsers enforce safer behavior.
They are not a replacement for secure code, but they reduce the impact of attacks such as clickjacking, cross-site scripting, and data leakage.
Headers worth checking
- Content-Security-Policy: restricts where scripts, styles, and other resources can load from.
- X-Frame-Options: helps prevent the site from being embedded in an iframe for clickjacking attacks.
- Strict-Transport-Security: tells browsers to use HTTPS for future visits.
- X-Content-Type-Options: reduces MIME-sniffing risks.
- Referrer-Policy: controls how much referrer data is sent to other sites.
Cookie flags matter too
Session cookies should typically use the Secure, HttpOnly, and SameSite attributes.
Secure ensures cookies are sent only over HTTPS.
HttpOnly helps prevent JavaScript access to session cookies.
SameSite reduces cross-site request forgery risk by limiting when cookies are attached to requests.
Scan the site for known vulnerabilities
After the basic browser checks, the next step is vulnerability scanning.
Automated scanners can identify outdated CMS versions, vulnerable plugins, exposed admin panels, and common misconfigurations.
Popular tools include:
- OWASP ZAP for dynamic application testing
- Burp Suite for manual and semi-automated security analysis
- Nessus or similar scanners for broader infrastructure checks
- WPScan for WordPress core, themes, and plugin issues
Use scanners carefully.
A scanner can reveal obvious issues quickly, but it can also generate false positives.
Treat results as leads that need verification, especially on production sites.
What the scan should reveal
A good scan may identify missing patches, open directories, exposed debug pages, outdated JavaScript libraries, or weak authentication controls.
For a WordPress site, check whether the core platform, theme files, and plugins are current and actively maintained.
Check CMS, plugins, and framework versions
Many website compromises come from outdated software rather than sophisticated exploitation.
If you control the site, check the CMS version, plugin inventory, theme version, and any third-party libraries that power the front end or backend.
Red flags include:
- Plugins with low install counts and poor maintenance history
- Themes downloaded from untrusted sources
- Frameworks with known end-of-life status
- Admin accounts that no longer need access
If a site uses WordPress, Drupal, Joomla, Magento, Laravel, or another major platform, review the official security advisories and update logs.
Security updates are often released because public exploits already exist.
Test login, forms, and access controls
Authentication flaws are common and expensive.
A website security check should verify how the site handles login attempts, password resets, administrative access, and user permissions.
Look for these protections:
- Multi-factor authentication for admins and editors
- Rate limiting or lockout controls after repeated failed logins
- Strong password rules and secure password reset flows
- Role-based access control that limits what each account can do
Public forms also deserve attention.
Contact forms, checkout pages, file upload features, and comment areas are common entry points for spam, injection attempts, and malicious uploads.
Confirm that server-side validation exists and that file types are restricted.
Inspect the site for malware and file integrity issues
Malware checks are essential if the site has shown unusual behavior, traffic drops, or browser warnings.
A hacked site can redirect visitors, inject spam links, or silently harvest credentials.
Common indicators include:
- Unexpected redirects to unrelated domains
- New admin users that were never created intentionally
- Injected scripts in page source or footer templates
- Modified core files or recently changed files outside normal deployment windows
If you manage the server, compare file hashes against a known clean baseline and review logs for suspicious activity.
If the site is hosted by a provider, ask whether they offer malware scanning, file integrity monitoring, or incident response support.
Check DNS, hosting, and domain-level protections
Website security also depends on infrastructure outside the browser.
DNS hijacking, poor registrar security, and weak hosting controls can compromise even a well-built application.
Review the following:
- Registrar account protection with MFA
- Domain lock or transfer lock enabled
- Accurate DNS records and no unexpected changes
- Hosting accounts protected by strong passwords and MFA
- Backups stored separately from the production server
If the site uses a content delivery network such as Cloudflare or Akamai, review firewall rules, bot protection, and origin server exposure.
A secure edge setup can reduce direct attacks, but the origin still needs protection.
Use trusted third-party reputation and transparency tools
Security verification is stronger when you cross-check with external data sources.
Reputation tools can reveal whether the domain has been reported for phishing, malware, or suspicious certificate issuance.
Helpful sources include Google Safe Browsing, VirusTotal, URLScan.io, and certificate transparency logs.
These tools can surface security history, recent scans, and certificate changes that are not obvious during a normal visit.
For organizations, it is also wise to monitor alerts from security vendors, hosting providers, and open-source vulnerability databases such as the National Vulnerability Database and the OWASP community.
Build a repeatable website security checklist
If you only check once, you miss ongoing risk.
Website security should be monitored continuously because updates, content changes, new plugins, and new vulnerabilities can appear at any time.
A practical recurring checklist can include:
- Verify HTTPS and certificate status weekly or monthly
- Run vulnerability scans after major updates
- Review admin accounts and permissions regularly
- Check logs for failed logins, strange requests, or file changes
- Patch CMS, plugins, frameworks, and server software promptly
- Confirm backups restore successfully
If the site handles personal data, payments, or healthcare records, consider formal reviews aligned with the OWASP Top 10, PCI DSS, or internal governance policies.
Higher-risk sites need more frequent testing and tighter control over change management.