Cloud security posture assessment tools

For cloud security posture checks during M&A or investment diligence, I’d use an agentless CSPM/CNAPP assessment backed by a focused security review—not just a compliance score.

The objective is to answer three questions: Can an attacker reach sensitive data? Are privileged identities overexposed? What security debt or remediation cost are you inheriting? This aligns with AWS’s M&A security guidance, which emphasizes evaluating the target’s security posture and planning remediation across the deal lifecycle.docs.aws.amazon.com+1

Best options to evaluate

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1. Wiz — best starting point for multi-cloud diligence

Strong fit when you need to connect misconfigurations, identity permissions, vulnerabilities and sensitive data into exploitable attack paths. Useful for ranking material risks instead of presenting a flat list of findings.www.complyjet.com+2

Best for: enterprise targets with complex AWS, Azure or GCP environments.

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2. Orca Security — best for fast, agentless assessment

Worth evaluating when diligence time is short and you need visibility into cloud assets, vulnerabilities, misconfigurations and sensitive data without deploying agents throughout the target environment.www.complyjet.com+2

Best for: rapid assessment with minimal operational disruption.

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3. Microsoft Defender for Cloud — best for Azure-heavy targets

A practical choice if the target already uses Azure and Microsoft security tooling. Review security recommendations, control gaps and exposure of privileged identities and sensitive storage.learn.microsoft.com+1

Best for: Azure-centric companies and Microsoft-standardized buyers.

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4. Prowler — best for a low-cost baseline

An open-source option for cloud configuration and compliance checks. Good for an initial technical screen or independent validation, but expect more manual triage and analysis than with a commercial platform.docs.aws.amazon.com+6

Best for: smaller targets, budget-conscious diligence or security teams that want direct evidence.

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What the diligence check should cover

Regardless of tool, I would require evidence across these six areas:

How I’d run the assessment

1. Obtain read-only access to every cloud organization, account, subscription and relevant region.
2. Run a point-in-time scan and reconcile the discovered inventory against the target’s declared environment.
3. Prioritize exploitable paths, especially public exposure combined with excessive identity permissions or sensitive data access.
4. Request supporting evidence for claimed controls, recent incidents, logging retention, backup recoverability and remediation history.
5. Deliver a deal-ready risk register with severity, evidence, business impact, remediation owner, estimated cost and recommended pre-close versus post-close action.

The output should inform deal terms and integration planning, not merely produce a security score. AWS’s M&A security guidance provides a useful framework for this.docs.aws.amazon.com+1

My recommendation: Start with Wiz for broad, multi-cloud attack-path analysis; consider Orca for rapid agentless assessment, or Defender for Cloud when the target is predominantly Azure. Validate access requirements, coverage and reporting on the actual target before committing to a vendor.

One important distinction: Are you doing buy-side M&A diligence on a company you may acquire, or vendor/third-party cloud risk diligence? The best assessment scope and evidence requirements differ significantly between those two cases.

For due diligence, I’d look beyond a basic CSPM checklist and evaluate platforms that can establish: what assets exist, how exposed they are, who can access them, which controls are failing, and whether the findings are actually being remediated.

My current shortlist

Recent 2026 comparisons similarly put Wiz, Prisma Cloud, Defender for Cloud, Orca, CrowdStrike and Tenable among the leading options, although rankings vary substantially depending on evaluation criteria.protego.me

What I'd use for actual due diligence

1. Wiz — my default choice for an independent cloud posture review

Particularly good when you don't want the assessment tightly coupled to one cloud provider. The important thing isn't merely its number of findings; I'd want to see its asset inventory, attack-path/context analysis, identity exposure, internet exposure, sensitive-data exposure, and remediation evidence.

2. Prisma Cloud — strongest choice for a deep enterprise assessment

I'd put this near the top if the target has substantial Kubernetes/container, IaC, application-security, or multicloud complexity. It's more of a full CNAPP evaluation than simply "is the AWS account configured correctly?"

3. Microsoft Defender for Cloud — especially attractive for Microsoft-centric targets

Microsoft currently provides CSPM across Azure, AWS and GCP, including continuous assessment against security standards and risk-prioritized recommendations. Its advanced CSPM capabilities include governance, regulatory compliance, Cloud Security Explorer and attack-path analysis.learn.microsoft.com

For a company already paying for Microsoft security products, this can make the economics particularly attractive.

4. Orca — strong second opinion

I'd consider Orca when you want an agentless assessment and a relatively straightforward way to understand cloud risk without deploying extensive agents throughout the target environment.

5. Prowler — excellent independent verification

For M&A or vendor due diligence, I particularly like the idea of pairing a commercial CNAPP with an independent technical assessment. Prowler can give you a second set of eyes on configuration and compliance rather than simply accepting the incumbent security team's dashboard.

The due-diligence test I'd actually run

Rather than asking vendors to demonstrate 100 features, give them a controlled set of questions:

• Inventory: Can you discover every AWS/Azure/GCP account, subscription, project, workload and exposed resource?
• External exposure: Can you identify internet-facing resources and explain why they're dangerous?
• Identity: Can you find excessive privileges, dormant identities, cross-account trust and privilege-escalation paths?
• Data: Can you identify sensitive data stores and determine who/what can reach them?
• Configuration: Can you test against CIS, NIST, SOC 2, ISO 27001 and the organization's own policies?
• Attack paths: Can you demonstrate how multiple individually "medium" findings combine into a critical path?
• Prioritization: Does the tool distinguish an exploitable vulnerability on an internet-facing asset from an isolated configuration violation?
• Evidence: Can you export timestamped findings suitable for an investment committee, audit file or remediation plan?
• Remediation: Can you demonstrate that findings were actually fixed, rather than merely marked "resolved"?
• History: Can you reconstruct posture at a specific historical date?

That last group is particularly important for transactional due diligence: you want evidence of the target's security posture, not just a pretty current security score.

Microsoft's current tooling, for example, provides multicloud asset inventory, risk prioritization based on factors such as sensitivity and internet exposure, recommendations, attack paths and compliance reporting.learn.microsoft.com

My practical recommendation

If I were conducting an acquisition/vendor-security assessment today, I'd shortlist:

Wiz + Prisma Cloud + Defender for Cloud, then use Prowler or equivalent independent checks to validate important findings.

The winner shouldn't be whoever produces the lowest "risk score." I'd choose the platform that produces the most defensible evidence about material security risk and lets you trace each important finding from asset → exposure → identity/data impact → control failure → remediation.

If you tell me whether this is M&A due diligence, third-party/vendor due diligence, or an internal cloud audit, I can give you a much more specific vendor scorecard/RFP with ~30–40 questions and weighting.