A cyber security audit is one of the most effective ways to protect your business from modern threats. But many organisations still delay audits until something goes wrong, such as a ransomware attack, suspicious login activity, or a client asking for proof of security controls.
The reality is simple: you don’t need to wait for a breach to find weaknesses.
A structured cyber security audit checklist helps you review the key areas of your IT environment, identify risks early, and ensure your business is prepared for compliance requirements, client assurance requests, and cyber insurance expectations.
In this blog, we outline a practical cyber security audit checklist that every business should review to improve resilience and reduce risk.
Why a Cyber Security Audit Checklist Matters
A cyber security audit is not just about ticking boxes. It’s about understanding where your business is vulnerable and taking action before those gaps are exploited.
A clear checklist ensures your audit covers the most important areas, including:
- user access and permissions
- email and phishing protection
- backups and disaster recovery
- device security and patching
- network protection
- cloud configuration
- staff awareness and policy control
A cyber security audit checklist also helps you gather evidence, which is often required for certifications, compliance reporting, and supplier onboarding.
Cyber Security Audit Checklist: Key Areas to Review
Below are the most important areas that should be included in a professional cyber security audit.
1. User Accounts and Access Control
Weak access control is one of the most common causes of breaches.
Your cyber security audit checklist should review:
- Who has admin access and whether it is justified
- Whether users have access only to what they need
- Whether leavers are removed immediately
- Whether shared accounts exist (a major security risk)
- Whether password policies are enforced
- Whether multi-factor authentication (MFA) is enabled
If access controls are weak, attackers can move through systems quickly, even after gaining access to a single account.
2. Multi-Factor Authentication (MFA)
MFA is one of the simplest and most effective security controls.
A cyber security audit should confirm MFA is enabled for:
- email accounts
- cloud services such as Microsoft 365
- VPN and remote access tools
- admin accounts
- finance and payment platforms
Businesses without MFA are at significantly higher risk of credential-based attacks.
3. Email Security and Phishing Protection
Email remains the most common entry point for cyber attacks.
Your cyber security audit checklist should include:
- spam filtering and email threat protection
- phishing detection tools
- attachment and link scanning
- user reporting processes for suspicious emails
- secure email configuration (SPF, DKIM, DMARC)
A cyber security audit often reveals that businesses rely too heavily on basic filtering, leaving them exposed to advanced phishing.
4. Endpoint Security (Devices and Laptops)
Every device connected to your business systems is a potential target.
A cyber security audit should review:
- antivirus and endpoint detection tools
- encryption on laptops and mobile devices
- device patching and update policies
- removable media controls (USB risks)
- mobile device security for remote workers
- monitoring for unusual device behaviour
If one laptop is compromised, it can lead to wider access across the network.
5. Patch Management and Software Updates
Outdated systems are a major vulnerability, and cyber criminals actively search for them.
Your cyber security audit checklist should confirm:
- operating systems are updated regularly
- third-party software is patched (Adobe, browsers, Java, etc.)
- firmware updates are applied to network equipment
- unsupported systems are removed or upgraded
- patching is documented and scheduled
A cyber security audit will often identify old systems that have been forgotten, but still remain connected.
6. Firewall and Network Security Controls
A cyber security audit must include a review of your network perimeter and internal security controls.
Key areas include:
- firewall configuration and rule review
- open ports and unnecessary exposure
- intrusion detection and prevention settings
- secure remote access configuration
- Wi-Fi security standards and segmentation
- guest network separation
A cyber security audit checklist should also confirm your network is monitored for unusual activity.
7. Backups and Disaster Recovery
Backups are essential, but many businesses assume they are working without testing them.
Your cyber security audit checklist should review:
- whether backups run automatically
- how often backups occur
- where backups are stored (cloud/offsite)
- whether backups are encrypted
- whether backups are protected from ransomware
- whether recovery testing has been performed
A cyber security audit should confirm that backups are not only available, but recoverable.
8. Cloud Security Configuration
Many businesses use cloud services but fail to configure them properly.
A cyber security audit should check cloud environments for:
- secure access settings
- MFA enforcement
- file-sharing controls
- external user permissions
- admin account protection
- audit logging and monitoring
- secure data storage and retention
Misconfigured cloud permissions are a common cause of accidental data exposure.
9. Data Protection and GDPR Readiness
A cyber security audit checklist should include how your business handles data, including personal information and client records.
Key review points include:
- where sensitive data is stored
- who can access it
- how data is shared internally and externally
- whether encryption is used
- whether data retention policies exist
- whether breach response procedures are documented
Even businesses with strong IT controls can fail compliance checks if policies are missing or outdated.
10. Staff Training and Security Awareness
Cybersecurity is not only technical. Human error remains a major risk.
Your cyber security audit should assess:
- whether staff have completed cyber awareness training
- whether phishing simulations are used
- whether employees know how to report suspicious activity
- whether clear security policies exist
- whether onboarding includes IT security guidance
A strong cyber security audit checklist always includes people and process, not just technology.
11. Monitoring, Logging and Incident Response
If a breach happens, detection speed matters.
A cyber security audit should confirm:
- logs are being collected and reviewed
- alerts are set up for suspicious behaviour
- devices are monitored for threats
- there is a documented incident response plan
- the business knows who to contact during an incident
- recovery steps are clearly defined
Without monitoring, many breaches go unnoticed for weeks or months.
What Happens After a Cyber Security Audit?
A cyber security audit is only valuable if action is taken afterwards.
A good audit should provide:
- a clear list of risks ranked by severity
- practical recommendations and quick wins
- long-term improvements for resilience
- compliance support where required
- evidence documentation for client assurance
The best outcome of a cyber security audit is a structured roadmap that strengthens your security without disrupting daily operations.
How Often Should You Perform a Cyber Security Audit?
For most businesses, a cyber security audit should be carried out:
- at least once per year
- after major IT upgrades or system changes
- after a cyber incident or suspected breach
- before applying for certifications (Cyber Essentials, ISO 27001)
- when onboarding large clients or entering new sectors
If your business relies on cloud services, remote working, or sensitive client data, regular audits are essential.
Why Choose Marshall for a Cyber Security Audit?
At Marshall, we provide cyber security audits designed to give businesses clarity, control, and real protection.
Our approach is practical, structured, and focused on reducing risk. We don’t overwhelm you with jargon. We help you understand exactly what needs attention and how to strengthen your security.
A professional cyber security audit from Marshall helps you:
- identify vulnerabilities before attackers do
- strengthen your security controls
- improve compliance readiness
- build client confidence through documented evidence
- reduce the risk of downtime, data loss, and disruption
Whether you need a full audit or ongoing support, we help you build a secure and resilient IT environment.
Book a Cyber Security Audit Today
Cyber threats are not slowing down. The most effective way to stay protected is to review your systems regularly and fix vulnerabilities early.
If you want a clear cyber security audit checklist review and expert guidance on improving your security, we’re here to help.
Call 0203 384 9832 or email enquiries@marshallinfotech.com
