Cloud security is the set of technologies, policies, and practices that protect cloud computing environments, including infrastructure, applications, data, and identities, from threats. It encompasses detection, prevention, and response across IaaS, PaaS, and SaaS layers.
What does cloud security cover?
Cloud security is a foundational layer of any modern security program; the hub from cloud detection and response, identity threat detection, Kubernetes security, and SaaS security all extend from. It addresses protection across three service delivery models: infrastructure as a service (IaaS), platform as a service (PaaS), and software as a service (SaaS), each with its own security responsibilities and risk profile.
The main domains cloud security spans are identity and access management, data protection, workload and network security, application security, and continuous monitoring. No single tool covers all of these. Effective cloud security is a layered discipline, not a product category.
How does cloud security differ from traditional cybersecurity?
Traditional cybersecurity assumes a fixed perimeter, or a network boundary you defend. Cloud environments have no fixed perimeter. Resources spin up and down in seconds, users access systems from anywhere, and the attack surface constantly changes.
This creates security challenges that traditional tools weren’t designed for. Static firewall rules don’t account for ephemeral workloads. On-premises SIEM may not ingest cloud-native logs cleanly. IAM policies that work for on-premises AD behave differently in AWS or Entra ID.
| Aspect | Traditional security | Cloud security |
|---|---|---|
| Perimeter | Fixed network boundary | Dynamic, API-driven |
| Infrastructure control | Full | Shared with cloud provider |
| Scaling | Manual | Automatic—security must match |
| Visibility | Direct log access | API and cloud-provider logging |
| Identity | On-prem directory | Cloud IAM, federated identity |
The most important shift: in cloud environments, identity is the new perimeter. Compromised credentials are the most common cloud attack vector, which is why identity threat detection and response (ITDR) is a critical extension of cloud security.
Expert insights on reigning in cloud identity security
Dive into the challenges (and solutions) of complex cloud identity security with this candid, expert-led discussion.
What is the shared responsibility model?
Every major cloud provider operates on a shared responsibility model with a division of security ownership between the provider and the customer. Understanding where the provider’s responsibility ends and yours begins is foundational to effective cloud security.
Cloud providers are responsible for: Physical data center security, hypervisor infrastructure, core networking, and the availability of cloud services.
Customers are responsible for: Data, applications, identity and access management, operating system configuration, network controls within their cloud environment, and workload security.
The shared responsibility model is one of the most common sources of cloud security gaps. Many organizations assume their cloud provider handles more security than it actually does, particularly around IAM configuration, storage permissions, and workload protection.
What are the biggest cloud security threats?
Understanding the threat landscape is the first step to prioritizing the right defenses. The most prevalent cloud threats in 2026 are:
- Credential compromise: Stolen or phished credentials remain the leading initial access technique in cloud attacks. Attackers don’t need to exploit technical vulnerabilities if they can log in with valid credentials.
- Misconfiguration: Overly permissive IAM policies, publicly exposed storage buckets, and unencrypted databases consistently appear in cloud breach post-mortems. About 15% of cloud breaches trace back to misconfiguration.
- API abuse: Cloud environments rely on APIs for virtually everything. Unprotected or misconfigured APIs are a significant attack surface, used for lateral movement, data exfiltration, and privilege escalation.
- Lateral movement and privilege escalation: Once inside, attackers move across cloud accounts and services, looking for ways to escalate privileges and reach sensitive data.
- Cryptomining: Attackers compromise cloud workloads not just for data but for compute resources, spinning up workloads to mine cryptocurrency at the victim’s expense.
What are practical cloud security tips?
Five high-impact actions that improve cloud security posture without requiring a full program overhaul:
- Enable MFA everywhere. Multi-factor authentication is the single most effective control against credential-based attacks. Enforce it on all accounts, especially privileged ones.
- Apply least privilege to IAM. Audit cloud IAM policies regularly. Most environments have significantly over-permissioned roles, limiting permissions to what’s actually needed reduces blast radius when credentials are compromised.
- Enable cloud-native logging. CloudTrail (AWS), Cloud Audit Logs (Google Cloud), and Azure Monitor are foundational visibility tools. Without them, you’re investigating incidents blind.
- Monitor for behavioral anomalies. Rule-based detection alone misses sophisticated attacks. Behavioral analytics that detect unusual authentication patterns, abnormal API calls, and impossible-travel login events are essential.
- Extend coverage to SaaS and identity. Cloud security that stops at IaaS misses the full attack surface. SaaS applications and identity systems are primary targets—extend monitoring to cover them.
Frequently asked questions
What is the difference between cloud security and traditional cybersecurity?
Cloud security focuses on protecting dynamic, shared cloud environments, while traditional cybersecurity focuses on fixed on-premises infrastructure. Cloud security requires purpose-built approaches for identity, API security, and misconfiguration management, not just extensions of existing on-premises tools.
What are the biggest cloud security challenges?
The top challenges are misconfigured resources, compromised credentials, insecure APIs, lack of multi-cloud visibility, and shared responsibility model confusion. Of these, misconfiguration and credential theft account for the majority of cloud breaches.
Is the cloud more secure than on-premises?
Cloud environments can be as secure as or more secure than on-premises, but security depends on proper configuration, identity management, and continuous monitoring, not on the provider alone. The shared responsibility model means customers retain significant security obligations regardless of which cloud they use.
What is cloud detection and response (CDR)?
CDR is the practice of continuously monitoring cloud environments to detect threats, investigate suspicious activity, and respond to incidents in real time. Unlike CSPM tools that scan for configuration issues, CDR detects active threats as they happen, such as credential abuse, lateral movement, cryptomining, and container escape.
What cloud security services does Expel provide?
Expel provides 24×7 cloud detection and response across AWS, Google Cloud, Microsoft, Kubernetes, SaaS, and identity, combining AI-powered analysis with human expert investigation and response.
