Kubernetes Security Posture Management

Kubernetes Security Posture Management is the continuous discipline of measuring, enforcing, and reporting on the security configuration of a Kubernetes cluster. A one-time security audit produces a point-in-time finding set; KSPM produces a continuous measurement that detects drift as it occurs. In a cluster under active development, new workloads and configuration changes create new findings continuously — a point-in-time audit is out of date within weeks. KSPM addresses this by making posture measurement an ongoing operational function, not a periodic review event.

KubeVigil is open-source (Apache-2.0) — the source code is inspectable, the findings logic is auditable, and there is no vendor lock-in or per-node pricing. Commercial KSPM platforms offer broader feature sets — cloud account scanning, image registry scanning, compliance dashboard visualisation — at per-node price points that scale with cluster size. For teams whose KSPM requirement is Kubernetes security posture and policy-as-code, KubeVigil covers the core use case. We use commercial tools where the scope requires it; we do not recommend them where they do not add value over the open-source alternative.

Kubernetes security posture directly satisfies controls from SOC 2 Type II (System and Availability Criteria, Change Management), HIPAA Security Rule (Technical Safeguards, Audit Controls, Access Control), ISO 27001 (A.12 Operations Security, A.14 System Acquisition), and DORA Title II (ICT risk-management framework — ICT security, vulnerability management, and incident detection). We map each applicable control to the specific system artefact that satisfies it — a Kyverno policy, a KubeVigil scan result, a Kubernetes audit log entry — so the evidence is structured for the auditor, not just asserted.

Kyverno policies deployed as admission webhooks run at apply time — when a manifest is submitted to the Kubernetes API server. In practice, the developer experience is similar to a failing test: the violation message identifies the specific policy and the specific field that failed, the fix is usually straightforward, and the enforcement gate prevents the issue from reaching production. We integrate KubeVigil scanning earlier — at the CI stage — so manifest violations are caught before they reach the cluster admission webhook, giving teams faster feedback.

An exemption is a documented policy exception: the specific workload, the specific policy it exempts from, the business justification, the approver, and an expiry date. Kyverno supports exemptions through policy exceptions with a defined scope — the exception applies only to the named workload, not to the policy broadly. Every exemption is a git commit — reviewable, auditable, and time-bounded. An auditor can see both the policies that enforce and the exceptions that exist, and trace each exception to its approval record. This is preferable to an absent policy because it makes the privilege explicit.

KubeVigil supports both scheduled scans and CI-triggered scanning on manifest changes. We configure scheduled scans at a minimum daily cadence — sufficient to detect configuration drift introduced by direct API calls, manual kubectl operations, or cluster upgrades that change default configurations. For clusters with active development, we supplement daily scheduled scans with CI-triggered scanning on every merged PR that modifies Kubernetes manifests. Critical findings generate immediate alerts; non-critical findings accumulate in the weekly posture report. The full scanning cadence is documented in the continuous monitoring runbook we deliver as a final engagement deliverable.