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A defensible SaaS purchase requires more than a security questionnaire or a certificate. The review should connect the proposed business use to the supplier’s ownership, technology, data practices, integrations, resilience, contract, and exit plan. Procurement, the business owner, security, privacy, legal, and—when the service is critical—architecture and resilience teams should agree on the evidence required, record exceptions, and reassess the supplier after selection.
Use the checklist below as a risk-based workflow. Start with the service and its impact, use a consistent control vocabulary, scale the depth to the data and access involved, and make every unresolved risk visible to an accountable decision-maker.
1. Define the service and the business risk
Write a one-page service profile before sending questions to a supplier. It prevents a generic assessment from missing the risks that arise from your particular deployment.
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Business ownership and consequences
- Name the accountable business owner and the teams that will administer the service.
- Describe the business process, users, locations, and business units in scope.
- Document what happens if the service is unavailable, corrupted, compromised, or discontinued. Include operational, financial, safety, regulatory, and reputational effects.
- Classify the service by impact and set an assessment depth that is proportionate to that impact. A collaboration add-on with public information does not warrant the same evidence threshold as a system holding regulated records or controlling production infrastructure.
Data and decisions
- List every data category that may enter, leave, or be generated by the service: personal data, confidential business information, regulated records, credentials, source code, payment information, customer content, logs, prompts, and model outputs.
- State the jurisdictions, retention requirements, user populations, and residency expectations that apply.
- Ask whether the service makes decisions, profiles people, trains artificial-intelligence models, or uses customer content to improve a product. Require specific product settings and contractual commitments rather than relying on marketing descriptions.
- Map connections to identity providers, collaboration suites, cloud environments, payment systems, developer tooling, data warehouses, browsers, agents, and other sensitive systems.
2. Assess the supplier, not only the application
Product controls and supplier-level diligence answer different questions. A well-configured application can still create concentration, ownership, continuity, or downstream-provider risk. NIST SP 1326’s final quick-start guide, published July 8, 2026, organizes ICT supplier review around foreign ownership, control, or influence (FOCI), provenance, resilience, foundational cyber practices, and supply-chain tiers. NIST defines due diligence as “the investigative process of researching all available, pertinent information about a given supplier or product so that informed decisions can be made on new acquisitions or existing systems.”
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Ownership, location, and influence
- Who owns and controls the supplier, and what parent companies, investors, or government relationships matter to this procurement?
- Where is the supplier organized? Identify locations for engineering, support, operations, data processing, and privileged administration.
- Are foreign ownership, control, or influence considerations relevant to the data, sector, or jurisdiction in which the service will operate?
Supply-chain visibility
- Obtain the names and functions of cloud hosts, subprocessors, critical dependencies, and material service providers that underpin delivery.
- Ask how the supplier identifies changes in that chain, assesses new providers, and informs customers of material changes.
- Require an explanation of incident coordination and customer communication when a downstream provider is involved.
Operational and financial resilience
- Request evidence of financial and operational ability to sustain the service, including staffing, support coverage, and reliance on a single cloud, region, or specialist provider.
- Ask how the supplier handles vulnerability disclosure and remediation, secure development, production access, emergency changes, and release approvals.
- Identify concentration risks that could affect many of your services at once, such as a shared hosting region or common identity dependency.
3. Choose a repeatable control baseline
A common vocabulary makes supplier answers comparable, but no framework or questionnaire proves that a service is safe for every deployment. Use the Cloud Security Alliance (CSA) resources as a starting point, then add controls driven by your data, integrations, sector, and contract.
| Resource | Purpose and scope | Published figure or description |
|---|---|---|
| CAIQ v4.1 | Questionnaire for documenting security controls in infrastructure, platform, and software cloud services. | CSA describes it as an industry-accepted way to document existing controls and provide security-control transparency. |
| Cloud Controls Matrix (CCM) v4.1 | Cloud security and privacy control vocabulary for structuring requirements and evidence. | 207 security and privacy controls, according to CSA guidance published in 2026. |
| SaaS Security Capability Framework (SSCF) | SaaS-oriented controls and implementation guidance focused on configurable, consumable, customer-facing capabilities. | Includes a questionnaire and implementation guidance for SaaS vendors and customers. |
| CAIQ-Lite and CCM-Lite | Condensed resources for a shorter first-pass review. | CAIQ-Lite contains 138 questions across 17 control domains; CCM-Lite is a 96-control subset, according to CSA’s 2026 guidance. |
Use the Lite resources to triage low-impact services or begin discovery, not to imply that organization-specific risks have been covered. For every omitted control, record why it is out of scope and what compensating measure, if any, addresses the exposure.
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4. Verify security controls and assurance evidence
Ask for evidence that covers the exact service, legal entity, regions, subscription tier, and review period you are buying. Record the evidence date, scope, exclusions, exceptions, and complementary customer controls.
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- How are administrative and production accesses requested, approved, limited, monitored, and removed?
- Does the purchased tier support single sign-on, multifactor authentication, role-based access, privileged-access management, and exportable audit events?
- Are support personnel prevented from viewing customer content by default? What exceptional access is possible, who approves it, and what is logged?
Protection and software assurance
- How is data encrypted in transit and at rest? Who controls encryption keys, and can customers use customer-managed keys where required?
- What backup, restore, vulnerability-management, penetration-testing, secure-development, dependency-management, and change-management practices apply to this service?
- How are tenants segregated, and what tests demonstrate that one customer cannot access another customer’s information?
- Which controls are configurable by your administrators and which are entirely provider-operated?
Incidents and recovery
- How does the supplier detect, classify, contain, investigate, and remediate incidents? Ask how evidence is preserved and how customers are notified.
- What recovery time and recovery point objectives apply to the service, and when were continuity and restore tests last performed?
- Which dependencies could prevent recovery, and what workarounds or alternate regions exist?
CSA describes CAIQ v4.1 as offering “an industry-accepted way to document what security controls exist in IaaS, PaaS, and SaaS services, providing security control transparency.” Treat that transparency as input to a decision, not as a guarantee. A certificate, an attestation, or a completed questionnaire may have narrow scope, stale evidence, exceptions, or controls that depend on your configuration.
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5. Examine data protection, privacy, and AI use
Translate the service profile into explicit data questions. The answers should align with your privacy notices, records of processing, regulatory duties, and negotiated contract.
- What data is collected, generated, inferred, profiled, or logged? Identify telemetry, diagnostics, prompts, uploaded files, outputs, and support records.
- Is customer content used for advertising, analytics, product improvement, model training, or any other secondary purpose? Ask whether each use can be disabled or contractually prohibited.
- Where are primary data, replicas, backups, and support-access records stored and processed? What regional controls and transfer mechanisms are available?
- What are the retention, deletion, export, and backup-expiration procedures? Require a method to evidence deletion after termination, including residual copies that remain until backup expiry.
- Which subprocessors handle personal or confidential data? How are customers notified of additions or material changes, and what objection or termination process applies?
- What assistance will the supplier provide for data-subject requests, breach cooperation, regulatory inquiries, legal holds, and mandatory retention?
- For AI features, can the feature be disabled, limited to selected users, or prevented from accessing sensitive data? Are prompts, outputs, and files retained or used to train models? Are external model providers or AI subprocessors involved?
6. Make identity, OAuth, and integrations a separate gate
Integration risk can exceed the risk of the application’s normal user interface. Create a distinct review whenever the supplier requests API access, OAuth scopes, service accounts, browser extensions, autonomous agents, or stored credentials.
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Permission design
- List every OAuth scope, API permission, service identity, and administrator role required. Can access be limited to named users, selected data sets, or specific functions?
- Can the organization revoke access centrally? Can it detect anomalous activity performed under the application identity?
Secret handling
- Does the supplier store refresh tokens, API keys, passwords, or other credentials? Identify storage location, encryption, personnel access, and separation between support, engineering, and operations.
- What are the rotation, expiration, revocation, and emergency-reset procedures? What happens when an employee, subprocesser, or integration is removed?
- Which access is logged, how long are logs retained, and can customers export them to their monitoring platform?
Compromise response
CSA Foundation’s 2026 guidance specifically calls for documenting token-storage architecture, access controls, rotation policies, breach-notification commitments, and audit logging for vendors that store customer credentials. Require a prompt notification commitment when tokens or integration credentials may be compromised, and define the cooperation needed to investigate and revoke them.
7. Negotiate contract, continuity, and exit terms
Security evidence cannot compensate for an agreement that leaves data use, incident cooperation, or exit obligations unclear. Procurement, legal, privacy, the business owner, and—where appropriate—resilience specialists should resolve these points before production use.
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- Permitted use: Define processing purposes, confidentiality, security duties, ownership, and restrictions on secondary use of customer data.
- Incidents: Set notice timing, communication channels, cooperation duties, evidence preservation, customer-regulator support, and remediation responsibilities.
- Subprocessors: Require disclosure, flow-down obligations, material-change notice, and an appropriate objection or termination mechanism.
- Assurance: Specify reports, certifications, penetration-test summaries, audit rights or alternatives, treatment of material gaps, and deadlines for corrective action.
- Availability: Address service levels, maintenance notices, support escalation, disaster recovery, continuity testing, and responsibility for dependency failures.
- Portability: Define export formats, APIs, metadata included, export frequency, transition assistance, and fees or time limits.
- Deletion: Set deletion deadlines, backup-expiration treatment, and written confirmation or technical evidence of completion.
- Termination: Clarify termination triggers, renewal and notice dates, price or service changes, suspension rights, and obligations that survive termination.
These are negotiation prompts, not universal legal clauses. Apply the law, regulatory requirements, bargaining position, and risk tolerance of the specific engagement.
8. Record a decision that can be defended
Turn the assessment into an auditable decision record rather than a pass/fail score.
- Describe the use: Record the business owner, process, users, data classes, integrations, jurisdictions, impact, and proposed subscription tier.
- List inherent risks: Capture supplier concentration, data sensitivity, privileged access, integration permissions, AI use, continuity dependence, and exit difficulty.
- Map evidence: For each material control, note the document, scope, date, exceptions, owner, and whether the control is provider- or customer-operated.
- Separate evidence gaps from control failures: A missing report is not automatically a failed control, but it is an unresolved uncertainty. Set an acceptable substitute, owner, and due date.
- Apply conditions: Examples include prohibiting production data until SSO and logging are enabled, restricting the pilot to synthetic data, limiting OAuth scopes, or requiring a remediation milestone before expansion.
- Accept residual risk explicitly: Name the executive or risk owner who accepts what remains, why the business benefit justifies it, and what monitoring is required.
- Schedule reassessment: Tie review dates to renewal and to events such as major service changes, new data classes, new subprocessors, significant incidents, control failures, ownership changes, or architecture changes.
9. Continue oversight after award
Selection is not the end of diligence. CISA’s Software Acquisition Guide for Government Enterprise Consumers, Version 2, frames software risk questions across market research, requirements, evaluation, supplier selection, and post-award monitoring. Its purpose is “to provide context of relevant USG guidance in terms of questions that should be addressed concerning means to mitigate risk exposure to enterprises attributable to software that is obtained from third parties, especially for high assurance and medium assurance environments.”
Assign an owner for collecting updated assurance reports, reviewing subprocessor notices, tracking incidents and remediation, testing exports and revocation, and confirming that the deployed configuration still matches the approved use. Reopen the assessment when the service adds AI processing, requests broader permissions, changes hosting regions, experiences a material incident, or becomes critical to a new business process.
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