Supplier Information Security Requirements

You must formally define supplier information security requirements and communicate them to every supplier and subcontractor that handles your confidential automotive data, with clear flow-down obligations through the supply chain. Operationally, this means contractually binding requirements, onboarding controls, verification, and ongoing oversight that proves suppliers meet your required security baseline. (VDA ISA Catalog v6.0)

Key takeaways:

• Put requirements in writing, tie them to data handling, and make them contractually enforceable. (VDA ISA Catalog v6.0)
• Ensure requirements flow down to subcontractors, not just your direct suppliers. (VDA ISA Catalog v6.0)
• Retain evidence that you communicated, accepted, and monitored supplier compliance for confidential automotive data. (VDA ISA Catalog v6.0)

“Supplier information security requirements” becomes real the moment a third party touches your confidential automotive data: CAD files, test results, firmware, manufacturing parameters, pricing, or any OEM-provided confidential information. VDA ISA 4.1.1 expects you to define what security looks like for those suppliers and subcontractors, then prove you communicated and enforced it across the chain. (VDA ISA Catalog v6.0)

For a Compliance Officer, CCO, or GRC lead, the fastest path is to treat this as a repeatable requirement package: a written baseline (what must be true), a distribution method (how suppliers receive it), a contractual mechanism (how it becomes binding), and an assurance loop (how you verify it keeps working). The audit risk is rarely the absence of a security policy; it’s the gap between your internal controls and what suppliers actually do with your data.

This page gives requirement-level implementation guidance you can execute without turning it into a multi-quarter redesign. It focuses on: applicability scoping, a practical control set you can publish as “supplier security requirements,” how to embed flow-down to subcontractors, what evidence to retain, and the exam questions that tend to break programs.

Regulatory text

Requirement (VDA ISA 4.1.1): “Define and communicate information security requirements to suppliers and subcontractors who handle confidential automotive data.” (VDA ISA Catalog v6.0)

Operator interpretation:
You need a documented set of information security requirements, targeted to suppliers and subcontractors that handle confidential automotive data, and you must show that those requirements were communicated and apply through the supply chain (flow-down). This is not satisfied by a generic “Supplier Code of Conduct” alone; you need requirements that are specific to information security and data handling, and you need proof they were issued and accepted. (VDA ISA Catalog v6.0)

Plain-English interpretation (what the requirement means)

If a third party can access, store, transmit, process, or create confidential automotive data for you, you must:

1. Define what security controls you expect them to follow,
2. Communicate those requirements before or at the start of access, and
3. Extend those obligations to subcontractors they use to deliver your service. (VDA ISA Catalog v6.0)

The practical test: could you show an assessor the exact security requirements you sent Supplier A, demonstrate the supplier agreed to them, and confirm the supplier also bound its subcontractor to equivalent obligations for the data in scope?

Who it applies to (entity and operational context)

Organizations: Automotive suppliers and OEMs operating under the VDA ISA / TISAX expectations. (VDA ISA Catalog v6.0)

Suppliers and subcontractors in scope: Any third party that handles confidential automotive data in any form, including:

• Engineering and design partners (CAD/CAE, prototyping)
• Software developers and test labs (source code, test artifacts)
• Cloud and IT outsourcing providers (hosting, managed services, ticketing tools with attachments)
• Manufacturing and logistics partners where labels, BOMs, or process data reveals confidential info
• Consultants/contractors with access to OEM portals or internal repositories

Operational trigger: Access to confidential automotive data, including one-time transfers (email/file share), ongoing system access (VPN, portal, API), or physical handling (prints, media). (VDA ISA Catalog v6.0)

What you actually need to do (step-by-step)

1) Define “confidential automotive data” for supplier purposes

Create a short internal definition aligned to your contractual confidentiality obligations with OEMs/customers, then map it to examples (CAD, specifications, test results, pricing). Keep it practical: teams must be able to decide whether a supplier engagement is in scope without a committee.

Artifact: Data classification or handling standard section for “confidential automotive data,” plus examples and labeling rules.

2) Build a Supplier Information Security Requirements (SISR) baseline

Write a supplier-facing requirements document (two to five pages works well in practice) that includes, at minimum:

• Access control: named accounts, least privilege, MFA where supported, timely removal
• Encryption: for data at rest and in transit where the supplier stores/transmits your data
• Secure collaboration: approved channels for file transfer; restrictions on personal email/storage
• Segregation: prevent cross-customer data mixing in shared environments where relevant
• Incident notification: how quickly and to whom the supplier must notify you of a suspected compromise affecting your data
• Subcontractor flow-down: supplier must impose equivalent requirements on any subcontractor touching your data and remain accountable
• Right to verify: right to request evidence, conduct assessments, or receive attestations

Keep the language testable: “Supplier must…” and “Supplier must provide evidence upon request…”

Artifact: “Supplier Information Security Requirements” document versioned and owned by a control owner (InfoSec/GRC).

3) Decide how requirements are communicated (and make it provable)

Pick at least one formal distribution channel:

• Contract package attachment (MSA/SOW exhibit)
• Supplier onboarding portal acknowledgment
• Purchase order terms incorporating the SISR by reference

Then ensure your process records date sent, version, and recipient acceptance.

Evidence: Supplier acknowledgment records, email transmittals with attachments, portal logs, executed contract exhibits.

4) Make requirements contractually binding

Communication alone is fragile. Convert requirements into enforceable obligations:

• Add the SISR as an exhibit to the MSA/SOW, or incorporate it by reference with clear precedence language.
• Include a subcontractor clause: supplier may not engage subcontractors for in-scope work without binding them to equivalent information security requirements and confidentiality obligations.
• Add audit/assurance rights tied to the data and service risk.

Evidence: Executed agreements showing the SISR is incorporated and flow-down language exists.

5) Implement risk-based onboarding checks before access is granted

For suppliers handling confidential automotive data, gate access on minimum checks, such as:

• Confirm the supplier can meet your access, encryption, and incident reporting requirements.
• Validate the supplier’s points of contact for security and incident response.
• Record the systems/data the supplier will access and the approved transfer methods.

This can be lightweight for low-risk suppliers and deeper for high-risk suppliers, but it must be consistent and documented.

Evidence: Completed onboarding checklist, risk review notes, approval record, and access provisioning ticket linked to approval.

6) Ensure subcontractor flow-down works in practice

Flow-down fails most often because it’s “promised” but never evidenced. Require at least one of:

• Written confirmation listing subcontractors used for your engagement and their role
• Contractual representation that subcontractors are bound to equivalent controls
• Evidence on request (e.g., subcontractor security addendum or confirmation letter)

Also require notice if subcontractors change during the engagement.

Evidence: Subcontractor register for the engagement, supplier attestations, change notifications.

7) Run an ongoing assurance loop

Set a cadence tied to engagement risk and data sensitivity:

• Periodic re-acknowledgment when the SISR changes materially
• Spot checks for data transfer methods and access rosters
• Review of incident notifications and near misses involving suppliers

Evidence: Review logs, updated acknowledgments, supplier performance/risk review notes, remediation tracking.

Required evidence and artifacts to retain

Use an “auditor pack” approach. For each in-scope supplier, retain:

• Supplier Information Security Requirements (current + prior versions) and ownership/approval record
• Proof of communication (sent date, version provided)
• Proof of acceptance (signed exhibit, portal attestation, contract clause incorporating it)
• Scope record: what confidential automotive data is shared and via what systems
• Subcontractor flow-down evidence: subcontractor list/attestation and change notices
• Assurance records: onboarding checklist, risk decision, follow-up issues and closure evidence All of this supports the “define and communicate” requirement and demonstrates flow-down. (VDA ISA Catalog v6.0)

Common exam/audit questions and hangups

Assessors commonly probe:

• “Show me the exact requirements sent to Supplier X and evidence they agreed.”
• “Which suppliers handle confidential automotive data, and how do you know?”
• “How do you ensure subcontractors are covered? Show evidence.”
• “What happens if requirements change? How do suppliers get updated versions?”
• “Who can approve exceptions, and where are exceptions documented?”

Hangups that slow audits:

• Requirements exist internally but are not supplier-facing.
• Contracts reference “industry standard security” without specifics.
• Subcontractor management is assumed, not evidenced.

Frequent implementation mistakes (and how to avoid them)

1. Mistake: One generic clause for all suppliers.
   Fix: Create a baseline SISR and add addenda for higher-risk scenarios (remote access, hosting, software development). Keep the baseline consistent. (VDA ISA Catalog v6.0)

2. Mistake: No link between data classification and supplier scope.
   Fix: Add a simple intake question: “Will the third party handle confidential automotive data?” If yes, SISR is mandatory and tracked.

3. Mistake: Flow-down language without a mechanism.
   Fix: Require subcontractor disclosure for in-scope work and reserve the right to request proof of binding terms.

4. Mistake: Requirements are emailed but not controlled.
   Fix: Version the SISR and store acknowledgments against that version. An uncontrolled PDF breaks traceability fast.

5. Mistake: Exceptions happen in Slack.
   Fix: Use an exception form with compensating controls, approver, expiry, and re-review trigger.

Enforcement context and risk implications

No public enforcement cases were provided in the source catalog for this requirement. Practically, the risk is contractual, operational, and reputational: supplier mishandling of confidential automotive data can trigger customer claims, loss of OEM trust, and assessment findings that limit business eligibility in automotive supply chains. (VDA ISA Catalog v6.0)

Practical execution plan (30/60/90)

First 30 days: establish the minimum viable requirement set

• Inventory suppliers that handle confidential automotive data (start with engineering, IT, quality, manufacturing support).
• Draft your Supplier Information Security Requirements baseline with flow-down clause language.
• Standardize contract hooks: add SISR as an exhibit template and update onboarding steps to require acknowledgment before access.

By 60 days: make it repeatable and provable

• Implement an intake workflow that flags in-scope suppliers and routes them through security requirements distribution.
• Centralize evidence collection (contract, acknowledgment, onboarding checklist, subcontractor disclosure).
• Train procurement and supplier managers on when SISR is required and what “no access before acceptance” means.

By 90 days: close gaps and operationalize assurance

• Remediate top gaps for critical suppliers (missing acceptance, outdated requirements, unclear subcontractor usage).
• Add a change-management step: when SISR updates, identify impacted suppliers and re-issue.
• Run an internal mock assessment for a sample of suppliers and build a ready-to-share assessor packet.

Tooling note: If you need a single system of record for supplier requirements distribution, acceptance tracking, subcontractor disclosures, and evidence packaging, Daydream can serve as the workflow layer so audits are a pull, not a scramble.

Frequently Asked Questions

Do I need different supplier information security requirements for every supplier?

Start with one baseline document for any supplier handling confidential automotive data, then add targeted addenda for specific risk patterns like hosting, software development, or remote admin access. Keep deviations as documented exceptions, not one-off emails. (VDA ISA Catalog v6.0)

What counts as “communicated” in an audit?

You need proof that the supplier received the requirements and that they are binding or acknowledged. An executed contract exhibit, portal attestation, or recorded acknowledgment tied to a document version typically works. (VDA ISA Catalog v6.0)

How do I handle subcontractors I don’t contract with directly?

Put flow-down obligations in the prime supplier contract and require subcontractor disclosure for in-scope work. Keep evidence of the supplier’s commitment and track changes to subcontractors during the engagement. (VDA ISA Catalog v6.0)

Can I accept a supplier’s own security policy instead of sending mine?

You can map their policy to your required outcomes, but you still need a defined requirement baseline and evidence that the supplier agreed to meet it for your confidential automotive data. Treat “policy review” as assurance evidence, not a replacement for requirements. (VDA ISA Catalog v6.0)

What if procurement says security language slows deals?

Pre-approve the SISR and contract exhibit language with Legal and Procurement, then make it a standard attachment for in-scope purchases. The operational win is consistency; negotiating from scratch creates delay and weakens audit evidence.

How do we handle suppliers that refuse audit rights?

Document the refusal, assess risk, and require alternative assurance (attestations, evidence reviews, or customer-facing assessments) plus compensating controls like reduced data scope and restricted access paths. Record the decision and the residual risk acceptance.