Build Series Vol. 09 — Cloud & SaaS Security Posture

The control plane where the estate actually lives — misconfiguration, privilege graphs, public exposure, and the SaaS tenants nobody has ever baselined.

The decision this volume is really about: prioritising findings when there is no exploited-vulnerability catalogue to lean on.

Control mapping first. The exact SOC 2, ISO 27001:2022, NIST CSF 2.0, CIS v8.1, CMMC, PCI DSS v4.0.1 and HIPAA clauses this build satisfies are printed before any installation step, so the work becomes audit evidence rather than a side effect of it.

A validation harness, not just a build. How to prove the control works and — the part nothing free covers — how to catch it failing quietly: the expired scan credential, the canary that stopped, the encryption key nobody can recover, the segmentation your diagram claims and your firewall does not.

Three sized architectures with honest hour counts. Tier 1 is 25–40 hrs to build · 5–8 hrs a month.

Stack: Prowler · Steampipe and Powerpipe · Cloud Custodian · Checkov.

Current as of August 2026. There is no open-source SSPM, and this volume says so rather than pretending otherwise — written tenant baselines beat a scanner you do not have. ScoutSuite has been unmaintained since May 2024 while remaining on nearly every recommendation list published since.

Every volume runs the same nine sections: prerequisites, control mapping, the decisions that matter, three sized architectures, a build runbook, a validation harness, an evidence pack, an operating cadence with honest hour counts, failure modes and the buy line, and an AI prompt pack.

Reading order: read 9th of ten. Each volume stands alone, and each is cheaper to build if the one before it exists.

Ships without support. This is a document, not a service contract — and Section 8 tells you plainly where the buy line is.