Moving to the cloud does not remove the need for security testing — it changes what you test. Cloud environments rarely fail the way on-premise ones do; they fail through configuration. Over-permissioned identities, exposed storage and quietly weakened settings cause far more cloud breaches than exotic exploits ever do. Cloud penetration testing is built around that reality, and understanding it changes how you should think about securing what you run in AWS, Azure or Google Cloud.
The shared responsibility model
Everything starts here, and misunderstanding it is the root of many cloud incidents. Your cloud provider secures the underlying infrastructure — the physical data centres, the hypervisors, the core managed services. You are responsible for how you configure and use what they provide: your identities, your permissions, your network settings, your exposed services and the applications you run on top. Cloud testing focuses squarely on your side of that line. It is not about attacking the provider’s infrastructure, which is both out of scope and their responsibility; it is about finding where your use of the cloud has left a door open.
What testing examines
- Identity and access management. Over-permissioned roles, unused access keys, weak trust relationships and paths to privilege escalation — consistently the most common and most consequential cloud weakness. In the cloud, identity is the new perimeter.
- Storage and data. Publicly exposed object storage, databases and snapshots — the classic source of large, embarrassing and entirely preventable cloud data leaks.
- Network exposure. Services reachable from the internet that should never be, and overly permissive security-group and firewall rules that accumulate over time.
- Configuration drift. Secure defaults quietly weakened as teams make changes under pressure, each individually reasonable but collectively dangerous.
- Workload security. The containers, serverless functions and applications running on top of the cloud, and how a foothold in one could spread laterally to others.
Configuration review and active testing together
Cloud security has two complementary halves, and doing only one leaves real gaps. A configuration review examines your account, identity and service settings against best practice, catching the misconfigurations that a purely external attack might never happen to reach. Active testing then probes what an attacker could actually reach and do, chaining weaknesses together to demonstrate genuine impact rather than theoretical risk. The strongest cloud assessments combine both: the review gives you the comprehensive map, and the testing gives you the proof that a given misconfiguration really does lead somewhere an attacker would want to go.
The pattern behind cloud breaches
Study real cloud incidents and a clear pattern emerges: they almost always start with a permission or a setting, not an exploit. An over-broad role here, a public bucket there, an exposed management interface, a forgotten test environment with production data — small configuration mistakes that, combined, hand an attacker a straightforward path to sensitive data. This is precisely why cloud testing weights identity and configuration so heavily: that is where the real risk concentrates, and it is also where the fixes are most achievable once you can see them.
In the cloud, the breach usually begins with a permission or a setting, not a zero-day. Test your configuration and your identities as seriously as you test your code — that is where the doors are actually left open.
Keeping it secure over time
Cloud environments change constantly, which means a single point-in-time test captures only a moment. The organisations that stay secure pair periodic penetration testing with continuous configuration monitoring, enforce least-privilege as a default rather than an afterthought, and re-test after significant architectural changes. Security that keeps pace with a fast-changing cloud estate is worth far more than an annual snapshot of an environment that looked very different by the time the report was read.
The takeaway
Whether you run on AWS, Azure or Google Cloud, the security questions are fundamentally similar: who can do what, what is exposed, and where has the configuration drifted from safe defaults. Test both your settings and what an attacker could actually achieve with them, combine review with active testing, and do it on a regular cadence and after major changes — and you address cloud breaches the way they actually happen rather than the way we imagine they might.