Sales cycle speed
A prepared evidence pack removes weeks from each security review and keeps deals on schedule.
Board and leadership view
Why vendor reviews matter to your board
The work is technical. The consequences of getting Vendor & TPRM wrong show up in revenue, liability and reputation, which is why we report on it in the language of the boardroom first.
Contractual and regulatory pressure
DORA, NIS2 and sector rules push buyers to demand documented supplier evidence.
Reputation and trust
Consistent, evidence-backed answers show buyers you run security as a discipline.
Ownership of the answers
One owner and one source of truth stop inconsistent responses across questionnaires.
Fit
Who this helps
SaaS vendors selling to enterprise
A prepared pack removes weeks from each deal cycle.
Security and procurement teams
A structured lifecycle ensures reviews are consistent and defensible.
Financial and regulated buyers
DORA, NIS2 and sector rules demand documented supplier due diligence.
Managed service providers
Clients treat you as a high-risk supplier because you access their systems.
Scope of work
What Summit delivers for Vendor & TPRM
One accountable team takes you from scoping to retest. The people who test your systems are the people who explain the findings to your leadership.
Gap analysis
Your answers and evidence compared with what SIG, CAIQ and buyer forms commonly ask.
Penetration testing
Human-led testing scoped to the service you sell, with proof of impact.
Control validation
Checks that the controls in your answers operate as described.
Evidence pack
A reusable bundle of reports, summaries and letters aligned to common questionnaires.
Remediation support and retest
Fix guidance, then a retest letter buyers can rely on.
Board-ready report
Posture and sales-readiness in language executives can use.
Fixed scope, one team, no hand-offsYou get a named lead, a clear scope document before work starts and a report your leadership, customers and reviewers can read without a translator. We stay with you through your review to answer questions about what we tested and found.
How it works
Build a vendor-ready evidence pack
Timelines are typical ranges, not promises. Yours depends on scope, team size and how much is already in place.
- 1
Collect the basics
Week 1Gather company overview, data flow diagram, hosting details and a list of subprocessors.
- 2
Publish core policies
Weeks 1 to 3Have clear, current information security, access control, incident response and continuity policies.
- 3
Get independent proof
Weeks 3 to 6Complete a SOC 2 or ISO 27001 effort where relevant and commission a penetration test.
- 4
Fix and retest
Weeks 5 to 8Close high and critical findings and obtain a retest summary.
- 5
Pre-fill questionnaires
Weeks 6 to 8Answer a SIG Lite or CAIQ once and reuse it, keeping answers aligned with the evidence.
- 6
Publish a trust page
OngoingGive buyers a self-serve place to find your evidence under NDA.
Deliverables
What your leadership team receives
Every engagement ends with material written for two audiences: a plain-language view for executives and the board, and full technical detail for the engineers who fix things.
An executive summary
Your readiness for vendor reviews and the gaps that slow deals.
A reusable evidence pack
Documents ready to send under NDA.
Questionnaire support evidence
Test reports and retest letters to cite in your answers.
A remediation tracker
Findings with owners, severity and status.
Support through buyer reviews
The same Summit team stays with you through follow-up questions.
The detail
What vendor security onboarding is
Third-party risk management (TPRM) is the way organisations decide which suppliers they can trust with data, systems or customers. Before onboarding a vendor, the buyer’s security team usually sends a questionnaire, asks for supporting documents and sometimes runs a call or an assessment of their own.
Common questionnaires include the SIG from Shared Assessments, the CAIQ from the Cloud Security Alliance and each buyer’s own bespoke form. They ask about governance, access control, encryption, incident response, business continuity and testing. Answers need evidence: policies, certifications or attestation reports, and independent penetration test results.
For vendors, the best strategy is to prepare a reusable evidence pack. For buyers, it is to tier vendors by risk so effort goes where impact is highest. Regulations such as DORA, NIS2 and sector rules make this process more formal each year.
Key terms in plain English
- Questionnaire
- A structured list of security questions the vendor must answer, often hundreds long.
- Evidence pack
- A bundle of documents that proves your answers: policies, reports, certificates and test summaries.
- Risk tiering
- Grouping vendors by data sensitivity and criticality to decide review depth.
- Fourth party
- A vendor’s own supplier, whose weaknesses can still affect the buyer.
Requirements
The vendor review lifecycle
A strong process has the same shape on both sides of the table. Here is what each stage looks like.
1
Intake and risk tiering
The buyer collects basic facts: what data the vendor will touch, how critical the service is and who owns the relationship. This decides whether a light or deep review is needed.
What it looks like in practice
- A short intake form
- Clear tier definitions
- A named business owner
2
Questionnaire and evidence review
The vendor answers the questionnaire and attaches evidence. Reviewers check consistency between answers, documents and any public information such as trust pages.
What it looks like in practice
- Answers with specific references to evidence
- Up-to-date certificates and reports
- A trust page or security overview for quick checks
3
Independent technical validation
For critical vendors, buyers request a recent penetration test summary or full report, sometimes a retest letter. This replaces back and forth with proof that weaknesses are found and fixed.
What it looks like in practice
- A recent human-led penetration test
- A retest confirming fixes
- Scope that matches the service being bought
4
Risk decision and contract terms
The buyer approves, approves with conditions or declines. Contract clauses cover security obligations, breach notification, audit rights and data return or deletion.
What it looks like in practice
- Documented risk acceptance
- Breach notification clauses
- Audit and termination rights
5
Continuous monitoring and reassessment
Risk changes over time. Buyers reassess important vendors regularly, watch for incidents and check that remediation promises were kept.
What it looks like in practice
- Annual reassessment
- Incident notification channel
- Tracking of open findings
Where testing fits
How penetration testing supports Vendor & TPRM
A recent penetration test report is one of the most requested documents in vendor reviews. A clear executive summary, honest scope, severity ratings and a retest letter let reviewers move on quickly.
Q: Pen testing
“Do you perform annual penetration tests?”
One of the most common questions. Answer with the date, scope, tester and retest status.
Q: Remediation
“How do you track and fix vulnerabilities?”
Findings with owners, deadlines and retest evidence answer this directly.
Q: Independence
“Is testing independent?”
Buyers prefer independent testers. Provide the testing firm and credentials.
Q: Coverage
“What systems were in scope?”
A scope statement that matches the service being sold avoids follow-up questions.
Avoid these
Common Vendor & TPRM mistakes, and how to avoid them
!
Answering from memory
Inconsistent answers across questionnaires raise red flags. Maintain one source of truth.
!
Sending a scanner export as a pen test
Reviewers want a human-led test with proof of impact and remediation advice.
!
Hiding known gaps
Buyers prefer honest gaps with a plan to unexplained “yes” answers that later fall apart.
!
Letting evidence expire
A report older than a year or a lapsed certificate triggers extra questions.
FAQ
Vendor & TPRM questions, answered
What is the difference between SIG and CAIQ?
SIG is from Shared Assessments and covers many risk domains in different depths. CAIQ is from the Cloud Security Alliance and focuses on cloud service controls. Both are widely accepted.
What should be in a vendor security evidence pack?
Policies, a security overview, SOC 2 or ISO 27001 evidence where available, a recent penetration test summary with retest, an incident response summary and a list of subprocessors.
How long does a vendor review take?
From a few days for low-risk vendors to several weeks for critical ones. A prepared pack and a clear point of contact are the biggest accelerators.
Do buyers accept a summary instead of the full report?
Often yes, under NDA. Critical vendors may be asked for the full report and a retest letter.
Can Summit help with questionnaires?
Yes. Summit supplies penetration test reports, retest letters and an evidence pack that back your answers, and stays with you through the buyer’s review.
Related frameworks
Often assessed alongside Vendor & TPRM
Security assuranceSOC 2The report enterprise buyers ask for first. Learn the five Trust Services Criteria, Type I vs Type II, and where penetration testing fits.Security assuranceISO 27001The international standard for an information security management system. Clauses, the 93 Annex A controls, and how certification works.EU regulationDORA & NIS2EU resilience rules for financial entities (DORA) and essential and important entities (NIS2): reporting clocks, TLPT and supplier risk.
Browse all 23 security and compliance frameworks or see our penetration testing services.
Helpful resources
ReportSample VAPT reportKeep reading on the Summit resources hub.ChecklistPre-launch security checklistKeep reading on the Summit resources hub.ReferenceSecurity glossaryKeep reading on the Summit resources hub.
Last reviewed October 2026. Requirements change; confirm current texts and dates before you commit to a plan.