How to Conduct a Website Security Audit

A website security audit is more than a malware scan. Assess the application’s attack surface, user permissions, dependencies, server configuration and incident-response capability together.

Audit's goal is not to eliminate every possibility, but to make the risks visible and prioritize them based on impact and likelihood.

Asset and attack-surface inventory

List domains, subdomains, admin panels, API endpoints, upload areas, third-party scripts and integrations.

Forgotten staging environments or old subdomains can create an unexpected attack surface.

TLS and HTTPS

Check the certificate chain and validity, HTTP redirects and mixed content.

Security headers

Content-Security-Policy
X-Content-Type-Options
Referrer-Policy
Permissions-Policy
Frame-embedding restrictions
HSTS suitability

Authentication

Strong password policy, 2FA and brute-force protection should be assessed in admin and critical user accounts.

Authorisation

Verify that users can perform only the actions permitted by their roles. Successful authentication does not grant access to all data.

Dependency and Patch Management

CMS, framework, plugin, theme, and package support status should be checked. Unused components must be removed.

File-upload and input security

Check file-upload areas for allowed file types, sizes and storage methods. Treat all user input as untrusted data.

Logging and incident readiness

Log failed sign-ins, administrative changes, application errors and critical security events so they can be investigated later.

How to assess production readiness

A page opening in a browser does not establish production readiness. Define measurable acceptance criteria for asset and attack-surface inventories, TLS and HTTPS, and security headers. Baselines for uptime, response time, error rate, deployment duration and critical user journeys make later changes easier to assess. Document key configuration differences between staging and production, and limit direct manual changes to the live system wherever possible.

Assess security and performance together. A CDN or cache can reduce origin-server load, but an incorrect caching rule can expose personalised content to other users. A WAF or request rate limit can reduce the attack surface, but must not disrupt critical APIs or integrations. Test security changes against realistic traffic scenarios and centrally monitor application logs, reverse-proxy logs and external-service health metrics.

Deployment and rollback plan

Before deploying a new release, updating the CMS or changing the infrastructure, verify that database and file backups are available. Prepare a maintenance or traffic-routing plan if needed, and design a rollback procedure for releases that include database migrations. After deployment, do not check only the home page: use smoke tests to verify business-critical functions such as login, forms, search, API access, payments and lead capture. This treats web infrastructure as an ongoing production system rather than a one-off project.

Web Infrastructure Technical Checklist

Are staging and production environments separate?
Can the deployment be rolled back?
Has a backup restore test been performed?
Are application and web-server logs monitored?
Have security headers and TLS been checked?
Have cache-bypass rules been tested?
Are runtime and dependency lifecycles tracked?
Do smoke tests verify critical user journeys?

Change management, SLOs and incident readiness

Assess technical quality beyond the initial launch. Updates can change dependencies, the CMS, runtime, cache, security rules and integrations. Track changes through tickets or release records so you know which version reached production and when, and define rollback procedures before critical changes. In particular, verify changes involving asset and attack-surface inventories, TLS and HTTPS, and security headers using comparable metrics before and after deployment.

Define measurable operational targets such as service level objectives (SLOs). Uptime, P95 response time, the 5xx error rate, success rates for critical forms or transactions and post-deployment errors show actual application health. Server availability alone is not enough: the home page may return HTTP 200 while a contact form, payment, search or API integration fails. Use synthetic checks or smoke tests for business-critical journeys alongside technical monitoring.

Before an incident occurs, define who will detect it, which team will respond first and when to roll back. Correlating logs, request IDs, deployment times and infrastructure metrics for the same incident speeds up root-cause analysis. After restoring service, record technical or process actions to prevent recurrence, rather than stopping at recovery. This helps the infrastructure become more resilient over time.

The B10 Digital Agency approach to web infrastructure

B10 Digital Agency treats web projects as production systems, not just interface development. Security, performance, deployment, integration, user experience and sustainable maintenance are designed together.

Frequently Asked Questions

Is security audit the same as penetration testing?

No. Penetration testing may form part of an audit; the audit also covers configuration and process checks.

Does HTTPS make the site completely secure?

No. TLS is only one important component of communications security.

Is it enough to add security headers?

No. Application, access, dependency and server security must be addressed together.

How often should a security audit be conducted?

Depending on risk and the frequency of changes, audits can be conducted periodically and after significant changes.

Make your web infrastructure secure and scalable

Explore the B10 Digital Agency approach to assess your website’s security, performance, deployment and integration architecture together.

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