A SaaS security review should determine whether a vendor's controls match the data, access, business dependency, and failure impact you are placing with it. A certificate or questionnaire can support evidence, but neither replaces risk-specific analysis.
Tier the Vendor First
Classify the service by data sensitivity and volume, privileged integration, user population, process criticality, availability need, substitutability, geography, and regulatory impact. Apply deeper review to higher exposure.
Name a business owner and technical owner. Procurement cannot accept operational or security risk on their behalf.
Understand Data and Architecture
Document data collected, purpose, controller/processor roles, storage and processing locations, subprocessors, encryption, tenant isolation, deletion, backup, export, and support access.
Map integrations and permissions. A scheduling tool reading public calendars differs from an automation platform holding write access to finance and customer systems.
Test Identity and Access
For material vendors, assess SSO, phishing-resistant MFA, role granularity, provisioning and deprovisioning, session control, privileged support, service accounts, access reviews, and audit logs.
Confirm that the purchased plan actually includes required controls; marketing documentation may describe a more expensive tier.
Assess Secure Operations
Request relevant assurance reports and their scope, period, exceptions, and management response. Examine vulnerability management, penetration testing, secure development, dependency controls, change management, logging, incident response, business continuity, and disaster recovery.
Use current evidence and resolve significant findings. “SOC 2 available” is not equivalent to reviewing the applicable report.
Contract for the Risk
Address security responsibilities, permitted processing, confidentiality, subprocessors, notification, cooperation, evidence, audit rights, deletion, return of data, service levels, continuity, liability, and exit.
Qualified legal and privacy advisers should adapt terms to applicable law; technical reviewers should ensure the promised controls are operationally possible.
Plan Failure and Exit
Decide how the business operates during an outage, compromise, acquisition, price shock, or termination. Test export format and completeness. Preserve configuration and integration knowledge.
For critical vendors, monitor material changes, incidents, assurance expiry, subprocessor changes, financial health, and control exceptions. Reassess when scope or data changes.
Make a Clear Decision
Record approve, approve with remediation, temporary exception, or reject. Include risk, evidence, owner, due date, compensating controls, and review date. Measure overdue reviews and exceptions, not questionnaire volume.
DualByte's cybersecurity service can perform risk-based vendor reviews and help implement compensating controls.
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