7 Most Common Mistakes in Cloud Security Configuration (and How to Avoid Them)

Cloud environments offer speed and flexibility, but configuration errors remain the leading cause of leaks in 2026. Here are 7 typical mistakes and how to avoid them.

1. Publicly Accessible Data Storage (public buckets) Mistake: uploading data and forgetting to disable public access. Consequence: search engines find them in minutes. How to avoid: always enable Block Public Access at all levels, use bucket policies with explicit deny.
2. Overly Broad IAM Policies Mistake: role with Action "" and Resource "". Consequence: one compromised key gives full access. How to avoid: apply least privilege principle, add conditions (IP, MFA, time).
3. No API Activity Logging Mistake: trails not enabled or not covering all regions. Consequence: impossible to determine who did what. How to avoid: enable full logging of all API actions, retain logs for at least 90 days.
4. Unencrypted Data at Rest and in Transit Mistake: using only HTTP or no at-rest encryption. Consequence: data leak during interception or storage access. How to avoid: enable default encryption, use KMS for key control.
5. Lack of Network Segmentation Mistake: all resources in one large network without private connections. Consequence: compromise of one host gives access to everything. How to avoid: use private subnets, security groups, private endpoints.
6. Insufficient Anomaly Monitoring Mistake: no rules for unusual activity (login from new region, mass requests). Consequence: attack detected post-factum. How to avoid: set up basic alerts for anomalies (new region, bulk actions).
7. No Key Rotation and MFA Mistake: long-lived keys without rotation and without mandatory two-factor. Consequence: stolen key used for months. How to avoid: rotate keys every 90 days, enforce MFA for all administrative roles.

These mistakes do not require complex tools — they arise from lack of systematic approach. Besspektikers is exactly about this: teaching how to see interconnections between layers and build protection that does not depend on a single setting.