A website security audit is essential for identifying vulnerabilities, meeting compliance obligations, and maintaining online trust. This guide offers a 10-step checklist to help Australian businesses strengthen their security posture in under a week.

Cybercrime in Australia is relentless. The Australian Cyber Security Centre (ACSC) recorded more than 76,000 cyber incidents in the 2023 financial year, roughly 13% more than the previous year.

For any organisation that collects or processes personal information, a breach also risks expensive penalties under the Australian Privacy Principles (APPs) and long-term reputational damage.

Search engines now demote or flag insecure sites so that lax security can erase organic visibility and customer trust overnight.

To help you avoid those costs, this blog gives you a 10-step website security audit checklist that Australia-based SMEs, enterprises, and agencies can use.

How to Use This Checklist

Treat the checklist like a mini-project. Work through each item sequentially, ticking it off once the control is verified. Assign clear owners, such as IT for technical tasks, Marketing for web content, and Legal for compliance, to avoid gaps.

Document screenshots, scan reports, and decisions; this evidence demonstrates the “reasonable steps” expected by APP 11. Finally, schedule quarterly re-audits and quick spot checks after every major website update.

10-Step Website Security Audit Checklist

Let us look at a 10-step website security audit checklist that you can use for your business:

1. Perform an Automated Website Vulnerability Scan

Run a trusted website vulnerability scan to uncover outdated CMS versions, vulnerable plugins, and risky misconfigurations. Export the Common Vulnerabilities and Exposures (CVE) report and turn it into a remediation roadmap.

This action aligns directly with the ACSC Essential Eight control to “Patch Applications.”

2. Enforce HTTPS & HSTS Site-Wide

Install a valid TLS certificate and force-redirect all HTTP traffic to HTTPS. Then add an HTTP Strict Transport Security (HSTS) header so browsers refuse insecure connections, blocking protocol-downgrade attacks.

Together, HTTPS and HSTS meet APP 11’s requirement for secure transmission of personal data.

Pro Tip: Use SSL Labs’ free SSL Test to score your HTTPS setup. Aim for an A+ rating, which demonstrates robust encryption and correct configuration to both users and search engines.

3. Patch CMS Core, Themes & Plugins Within 30 Days

Subscribe to your CMS vendor’s security bulletins and maintain a staging site to test updates. Aim to apply security patches within a 30-day window, and keep a simple spreadsheet that logs the patch name, date applied, and environment.

4. Lock Down Admin Access with Multi-Factor Authentication (MFA)

Enable Time-based One-Time Password (TOTP) or hardware-token MFA for every privileged account. Rename or disable the default “admin” username and set a limit on failed login attempts.

A study shows that MFA blocks more than 99% of credential-stuffing attacks.

5. Harden Input Validation & Output Encoding

Validate and sanitise all user input on the server side, then encode outputs to neutralise malicious characters. Complement secure coding with a Web Application Firewall (WAF) that filters injection and cross-site-scripting (XSS) attempts in real time.

Use the OWASP Application Security Verification Standard (ASVS) as your coding checklist.

6. Restrict User & File Permissions

Apply the principle of least privilege across your operating system, database, and CMS. Disable directory listing and set conservative file permissions.

Configuration files, for example, should rarely be more permissive than 640. Review permissions quarterly and whenever staff leave or change roles to prevent “permission creep.”

7. Schedule Encrypted, Off-Site Backups

Configure daily incremental and weekly full backups, encrypted and stored in a separate cloud region. Test a full restore monthly to validate integrity.

Powerful backups are your fastest route to recovery from ransomware and meet APP requirements for data restoration capability.

Also Read: The Ultimate Guide To Understanding What Is Encryption

8. Activate Real-Time Logging & 24/7 Monitoring

Centralise logs in a syslog server or Security Information and Event Management (SIEM) platform with at least 90-day retention. Create alerts for suspicious IP addresses, privilege escalation, and unexpected file changes. Rapid detection can shrink attacker dwell time from months to mere hours.

Pro Tip: Configure geo-blocking rules in your firewall or WAF to automatically deny access from countries irrelevant to your operations. This can reduce malicious traffic dramatically.

9. Publish an Incident Response & Breach-Notification Plan

Draft a concise plan that outlines technical contacts, executive decision-makers, and external reporting thresholds to ACSC and the Office of the Australian Information Commissioner (OAIC). Keep a breach-notification email template ready so you can meet APP 11.1(a) timelines. Run tabletop simulations twice a year to refine the process.

10. Train Staff & Agency Partners on Security Hygiene

Humans remain the weakest link. Conduct quarterly phishing simulations and refresher workshops; update onboarding and off-boarding checklists to include credential handover and revocation. Store the full security policy on your intranet and remind partners to review it.

Secure Your Online Presence with Our Website Security Audit

Security is never “one and done.” Set recurring calendar reminders to repeat this website security audit every quarter, and engage a certified penetration tester annually for deeper assurance. Subscribe to the ACSC Partner Program for real-time threat-intelligence feeds and industry alerts.

Partnering with Crazy Domains means you can focus on business growth while we implement, monitor, and optimise your website’s defences.

With us, you can focus on growth while we handle the heavy lifting!