By David Chernitzky, CEO & Co-Founder, Armour Cybersecurity · Toronto-based, serving organizations across North America · Last updated July 29, 2026
The migration to cloud computing has transformed how organizations build, deploy, and operate their technology. Cloud platforms deliver flexibility, scalability, and cost efficiency that on-premises infrastructure cannot match. For most organizations, cloud is not a future consideration, it is the present reality.
But cloud adoption has introduced a new set of security challenges that differ meaningfully from what organizations faced in traditional data centre environments. Many of the security assumptions and practices that worked well on-premises do not translate directly to the cloud. Organizations that fail to adapt their security strategies create vulnerabilities that attackers actively exploit.
Understanding the most significant cloud security risks is the first step toward managing them. The risks below are the issues most commonly found in real cloud environments, and the ones most frequently at the root of cloud security incidents.
Quick answer
Cloud security risks are threats, vulnerabilities, and misconfigurations that can expose cloud-hosted systems, applications, and data to unauthorized access, disruption, or loss. The most common cloud security risks include misconfigured cloud resources, weak identity and access management (IAM), insecure APIs, ransomware, data breaches, insider threats, and inadequate visibility across cloud environments. Reducing them takes continuous monitoring, strong governance, and a clear understanding of the Shared Responsibility Model.
Key Takeaways
- Cloud breaches are more often caused by customer misconfigurations than by cloud-provider failures.
- Identity and access management (IAM) weaknesses remain one of the leading causes of cloud incidents.
- Cloud Security Posture Management (CSPM) helps identify security gaps before attackers do.
- Continuous monitoring for misconfigurations, exposed assets, and suspicious activity is essential.
- Understanding the Shared Responsibility Model is fundamental to reducing cloud risk.
The Shared Responsibility Model
One of the most consequential misunderstandings in cloud security is the assumption that the cloud provider handles security. Cloud platforms operate highly secure infrastructure and provide extensive security tooling, but they work under a Shared Responsibility Model: the provider secures the cloud infrastructure itself, while the customer is responsible for what they build on it.
That means misconfigurations, access-control decisions, data protection, identity management, and application security are the customer’s responsibility, regardless of which platform is used. Responsibilities also shift depending on the service model:
- Infrastructure as a Service (IaaS)
- Platform as a Service (PaaS)
- Software as a Service (SaaS)
Organizations that treat the Shared Responsibility Model as academic rather than operational tend to learn its practical implications the hard way, usually through an avoidable incident.
Cloud Misconfigurations
If one finding appears most consistently in post-breach analyses of cloud incidents, it is misconfiguration. Cloud platforms are powerful and flexible, which also makes them complex and easy to configure incorrectly. Default settings are not always secure settings, and permissions that seem reasonable in a test environment can be dangerously permissive in production.
Common misconfiguration patterns include publicly accessible storage buckets containing sensitive files, overly permissive IAM policies, security groups or network ACLs that allow unrestricted traffic, databases exposed to the internet without authentication, and cloud functions with hard-coded credentials in environment variables.
What makes these especially dangerous is how easy they are to overlook. A single cloud environment can include thousands of resources, servers, storage buckets, databases, functions, queues, load balancers, each with its own configuration. One misconfigured resource is easy to miss in manual review and may be invisible without dedicated tooling. Because cloud environments change rapidly, even a minor error can expose sensitive data to the public internet within minutes.
Recommended mitigation:
- Continuous cloud security monitoring and configuration baselines
- Regular cloud security assessments
- Cloud Security Posture Management (CSPM) solutions to catch drift automatically
Weak Identity and Access Management (IAM)
Identity has become the primary security perimeter in the cloud. Cloud IAM allows extremely granular control over what each user, service, or application can do, but that same granularity creates significant room for error.
Overprivileged accounts are among the most common and most consequential findings. It is routine to find user and service accounts with administrator-level access when their real function needs only a fraction of those permissions. Broad access is faster to assign than carefully scoped access, but it becomes a serious liability if those accounts are ever compromised.
Other common IAM issues include:
- Not enforcing multi-factor authentication on console access
- Failing to rotate access keys and service-account credentials
- Leaving inactive accounts and access keys in place
- Using long-lived credentials where short-lived, role-assumed credentials would be safer
Compromised cloud credentials can give attackers access to infrastructure and data, plus the ability to spin up new resources at real cost to the organization. Strong identity and access management controls, least-privilege access, role-based access control, privileged access management, and MFA are the core defenses.
Insecure APIs and Exposed Interfaces
Cloud services are built on APIs. Every action in a cloud environment, provisioning a server, reading from a database, invoking a function, happens through an API call, and the management console is simply a graphical layer over those same APIs.
APIs that are not properly secured create significant attack surface. Common findings include unauthenticated endpoints, inputs that should be validated but are not, excessive permissions granted to API keys, and insufficient rate limiting that lets attackers extract data or disrupt service.
Organizations should inventory and monitor APIs, enforce authentication and authorization on every endpoint, assess APIs regularly for weaknesses and exposure, and manage API keys and credentials with the same rigor as any other privileged credential.
Lack of Visibility and Security Monitoring
Cloud environments generate enormous volumes of events, authentication attempts, API calls, resource changes, network flows, application logs. That data is a potential early-warning system, but without the tooling and processes to collect, analyze, and act on it, it is largely useless.
Many organizations enable some cloud logging but lack the monitoring and alerting to turn logs into action, so they discover incidents days, weeks, or months after initial access. Effective monitoring, often delivered through managed security services, means comprehensive logging across cloud services, centralizing that data in a SIEM, tuning alerts for suspicious patterns, and having a defined process to investigate and respond. Visibility also matters for compliance: proving to auditors that an environment is monitored requires evidence, not assertions.
Insecure Data Storage and Transmission
Cloud platforms offer many ways to store data, object storage, relational databases, data warehouses, file systems, caches, and each has its own security options that must be actively configured.
Data at rest should be encrypted using customer-managed keys wherever possible, with tight control over those keys. Data in transit, including internal service-to-service traffic, should be encrypted as well, since some default configurations do not enforce this. Data classification is a prerequisite: organizations that do not know where their sensitive data lives cannot reliably protect it, which is where cloud data discovery and classification tooling helps.
Insecure Third-Party Integrations and Supply Chain Risk
Modern cloud environments rarely stand alone. They connect to third-party services, partner systems, SaaS applications, and open-source packages, and the security of your environment is only as strong as the security of the third parties with access to it.
Supply chain attacks have grown more prominent, with attackers compromising popular open-source libraries or build tools to inject malicious code into thousands of downstream environments. Organizations should maintain an inventory of third-party integrations, perform regular supplier risk assessments, evaluate the security posture of critical third parties, apply least-privilege access to the connections they are granted, and monitor integration traffic for anomalies.
Cloud Security Posture Management (CSPM)
Cloud Security Posture Management provides continuous visibility into cloud environments and helps organizations find misconfigurations, compliance gaps, and exposed resources before attackers do.
CSPM solutions support:
- Continuous cloud monitoring
- Misconfiguration detection
- Compliance validation
- Risk prioritization
- Multi-cloud security governance
Organizations with mature CSPM programs are far better positioned to stay secure as cloud infrastructure grows and changes.
Frequently Asked Questions
What is the biggest cloud security risk?
Misconfigured cloud resources remain one of the most common causes of cloud security incidents, because they can unintentionally expose sensitive data and services to the public internet.
What is cloud security posture?
Cloud security posture is an organization’s ability to secure its cloud environments through effective governance, monitoring, identity management, and security controls.
How often should cloud security assessments be performed?
Cloud environments should be continuously monitored, with formal cloud security assessments conducted at least annually and after any significant infrastructure change.
What is the Shared Responsibility Model in cloud security?
The Shared Responsibility Model defines which security responsibilities belong to the cloud provider and which remain with the customer. The provider secures the infrastructure; the customer secures identities, configurations, applications, and data.
How can organizations reduce cloud security risk?
Through strong identity controls, CSPM solutions, continuous monitoring, vulnerability management, secure configurations, and employee security awareness training.
The Bottom Line
Cloud security takes more than deploying workloads to a trusted provider. Organizations have to continuously manage identities, configurations, applications, third-party integrations, and governance to keep risk in check, and most cloud incidents trace back to customer-side gaps rather than provider failures.
Armour Cybersecurity provides cloud security assessments and advisory support to help organizations find and fix the risks most relevant to their environments, whether you run on AWS, Azure, Google Cloud, or a hybrid mix. Cloud adoption does not have to mean accepting greater risk: with the right controls, monitoring, and practices, cloud can be as secure as, or more secure than, traditional on-premises infrastructure. Get in touch to talk through where your gaps are.
About the author
David Chernitzky is the CEO and Co-Founder of Armour Cybersecurity, a Toronto-based firm that protects organizations across North America from advanced cyber threats. He brings more than 25 years of cybersecurity and military cyber intelligence experience, having served as an officer in an elite technology unit before co-founding Armour. Armour’s team of military-intelligence veterans and senior advisors serves 260+ clients across 52+ industries with a 97% client retention rate.
