An IT security audit exists to answer one question honestly: where does this organisation actually stand? It surfaces vulnerabilities, misconfigurations and risks across the estate before an attacker does. This checklist sets out what a serious audit reviews, the failings it most often finds, and what to do with the result.
At a glance
- Purpose: a broad, honest map of posture — not a single exploit.
- Scope: assets, external exposure, vulnerabilities, configuration, identity, cloud, monitoring and backups.
- Outcome: a prioritised roadmap and evidence, not just a list of findings.
What an IT security audit is
It is a structured review of your security posture against good practice and, where relevant, a framework. Unlike a penetration test, which proves depth on specific targets, an audit measures breadth: it tells you how you are doing across the whole estate and where the gaps are.
The checklist: what to review
A complete audit works through eight areas. Each should end with findings, priorities and evidence.
- 1. Asset inventory. You cannot protect what you do not know you have; start with an accurate inventory of systems, services and owners.
- 2. External attack surface. What faces the internet — and should it? An attack-surface review catches forgotten exposure.
- 3. Vulnerability management. Not just a scan, but prioritisation, remediation and verification — see our vulnerability management service.
- 4. System configuration. Hardening against secure baselines; misconfiguration is a more common way in than exotic exploits.
- 5. Identity and access. Privileged accounts, MFA and least privilege across the identity estate.
- 6. Cloud security. Posture and permissions across cloud and SaaS, where much of the modern estate now lives.
- 7. Monitoring and detection. Would you see an intrusion? Logging and detection, ideally through a managed SOC.
- 8. Backups and recovery. Tested, isolated backups — the difference between recovering and paying a ransom.
The most common failings found in audits
Audits keep surfacing the same issues: incomplete inventories, forgotten internet-facing services, weak or inconsistent MFA, over-privileged accounts, unpatched perimeter devices, and backups that were never tested with a real restore. None is exotic; all are avoidable.
The benefits of regular audits
Periodic audits catch drift before it becomes exposure, give leadership a real view of posture, and produce the evidence that frameworks and customers increasingly ask for. Security is not a state you reach once; an audit is how you keep checking you are still there.
How to run a professional audit
You can use this checklist as a self-assessment, but a professional audit adds independence, benchmarks and a prioritised roadmap you can act on. To scope one for your organisation, browse our services, run a quick external check with our scanner, or get in touch.