M&A Vendor Cyber Exposure Review Checklist

An editable 17-page field guide for the analyst given a target company with hundreds of vendor relationships and a diligence window measured in weeks. Reviewing every vendor is not possible, so the guide works outward from the ones that can disrupt closing or Day 1: inherited access and data, contract gaps and assignment terms, concentration, unresolved incidents, and the transition actions that have to be funded. Every item explains why it matters, the result a good answer should produce, the evidence to request, and the next analyst move.

What’s inside

• A readiness page confirming the vendor entity, product, environment, region and service in scope, business criticality and data sensitivity, the internal owners who can validate each claim, and how restricted evidence will be handled
• 30 numbered items, MAV-01 to MAV-30, grouped into 5 control domains and classified as they are in the guide: 28 marked Core and 2 marked Elevated
• Transaction Scope and Vendor Population; Vendor Access Data and Contract Exposure; and Security Evidence Incidents and Findings
• Dependencies Resilience and Transition Risk; and Deal Decision Day 1 and Integration
• Response, evidence reference, action owner and due date against every item, so the completed form is the assessment record rather than a questionnaire you transcribe later
• A rapid final checklist that restates all 30 items on one page for the closing challenge

The assessment rule is written into the form: evidence should be current, complete for the service in scope, usable by your organization, tested where capability matters, and linked to a decision. A certificate, policy, screenshot or vendor statement is not enough on its own when it does not prove the specific requirement.