Common Threats Overview

Attackers follow a simple rule: go where the data is. As businesses move data to the cloud, attackers follow. Knowing the most common threats helps you build defenses before an attack happens rather than after.

Threat 1: Data Breaches

A data breach happens when an unauthorized person accesses your data. In the cloud, this often results from weak credentials, misconfigured storage, or unpatched application vulnerabilities. Think of it like leaving your diary in a public park — anyone walking by can read it.

A common example: a developer uploads code to GitHub and accidentally includes a database password in the file. An attacker finds it using an automated scanner, logs into the database within minutes, and copies thousands of customer records.

Threat 2: Misconfiguration

Misconfiguration is the leading cause of cloud security incidents. It happens when a cloud resource is set up incorrectly — for example, a storage bucket set to public, a firewall rule that allows all traffic, or an admin account with no password. These are not sophisticated attacks. They exploit simple human mistakes.

Misconfiguration Example:
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Storage Bucket Setting:   Public  ← WRONG
Storage Bucket Should Be: Private ← CORRECT

Result of wrong setting:
Anyone on the internet reads your files.

Threat 3: Insider Threats

An insider threat comes from someone inside your organization — an employee, contractor, or partner. They already have access to your systems. An insider might intentionally steal data before leaving the company, or accidentally delete critical files. Cloud environments make this worse because one person with cloud admin access can reach enormous amounts of data from any device.

Threat 4: Account Hijacking

Account hijacking happens when an attacker steals login credentials and takes control of a cloud account. Attackers use phishing emails, credential-stuffing attacks (trying stolen username and password combinations from other breaches), or social engineering. Once inside, they can access data, spin up expensive cloud resources (cryptojacking), or lock the real owner out.

Threat 5: Denial of Service (DoS) Attacks

A denial of service attack floods your cloud application with fake traffic until it slows down or crashes for real users. Imagine 10,000 people all trying to walk through a single door at once — no one gets through. In the cloud, large-scale DoS attacks (called Distributed Denial of Service or DDoS) can cause service outages and cost thousands of dollars in extra cloud usage fees.

Threat 6: Insecure APIs

Most cloud services communicate through APIs — programming interfaces that let different systems talk to each other. An insecure API is one that does not check who is calling it, does not validate the data it receives, or exposes more information than necessary. Attackers probe APIs to find these gaps.

API Security Gap Example:
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Secure API call:    GET /user/123  → Returns only user 123's profile
Broken API:         GET /user/123  → Also returns ALL other users' profiles

An attacker can harvest user data by changing the number in the URL.

Threat 7: Supply Chain Attacks

Your cloud application almost certainly uses third-party libraries or services. A supply chain attack targets those dependencies instead of attacking you directly. If a popular open-source library your app uses gets compromised, your app becomes vulnerable too — even if your own code is perfectly secure.

Threat 8: Cryptojacking

Cryptojacking happens when an attacker uses your compromised cloud account to mine cryptocurrency. They run powerful computing tasks at your expense. Your cloud bill spikes dramatically, and your legitimate workloads slow down. You pay for the attacker's profit.

Threat Likelihood at a Glance

Key Terms to Know

• Phishing: A deceptive email or message that tricks someone into handing over credentials.
• Credential Stuffing: Using leaked username and password pairs from other breaches to break into accounts.
• DDoS: Distributed Denial of Service — a flood of traffic from many sources targeting one system.
• API: Application Programming Interface — a defined way for software systems to communicate.

What You Learned

The most common cloud threats include data breaches, misconfigurations, insider threats, account hijacking, DoS attacks, insecure APIs, supply chain attacks, and cryptojacking. Most of these exploit human error or poor configuration rather than sophisticated technical exploits. Understanding each threat is the first step toward defending against it.