1. Purpose
The purpose of this Supplier Security Management Policy is to define how the organization identifies, evaluates, approves, monitors, reviews, and manages information-security risks arising from suppliers and third-party service providers.
The policy ensures that suppliers who provide technology, cloud, SaaS, professional, operational, infrastructure, or other services that may affect organizational information or systems are managed according to their security risk.
Core Principle
Identify → Assess → Approve → Contract → Control → Monitor → Review → Improve → Exit
2. Scope
This policy applies to suppliers and third parties that may access, process, store, transmit, support, or otherwise affect organizational information or information-processing facilities.
It includes:
- Cloud service providers
- SaaS providers
- IT service providers
- Managed service providers
- Software vendors
- Hosting providers
- Data processors
- Consultants
- Professional service providers
- Security service providers
- VAPT providers
- Audit and certification service providers
- Payment service providers
- Customer support providers
- HR and payroll providers
- Backup providers
- Infrastructure providers
- Telecom/network providers
- Software development partners
- Outsourced business-process providers
- Suppliers with physical or logical access
- Suppliers providing critical business services
The policy applies throughout the supplier lifecycle.
3. Supplier Security Objectives
The organization should:
- Identify suppliers that present information-security risk.
- Understand what information and systems suppliers can access.
- Assess supplier security before approval where appropriate.
- Include relevant security requirements in contracts.
- Control supplier access.
- Monitor supplier security performance.
- Periodically reassess supplier risk.
- Manage supplier incidents and security breaches.
- Control subcontractor and subprocessor risks.
- Manage supplier changes.
- Ensure appropriate data return or deletion.
- Securely terminate supplier relationships.
- Retain evidence of supplier security management.
4. Definitions
Supplier
An external organization or individual providing goods or services to the organization.
Critical Supplier
A supplier whose failure, compromise, or unavailability could significantly affect business operations, security, customers, compliance, or critical information.
Third Party
An external party that has a business relationship with the organization.
Subcontractor
A party engaged by a supplier to perform part of the contracted service.
Subprocessor
A third party engaged by a supplier to process personal or other regulated information on behalf of the supplier/customer relationship.
Supplier Security Risk
The potential for a supplier’s security weakness, incident, failure, unauthorized activity, or compromise to negatively affect the organization.
5. Supplier Security Principles
Supplier security should follow these principles:
5.1 Risk-Based Management
Not every supplier requires the same level of assessment.
Controls should be proportionate to:
- Information accessed
- System criticality
- Business dependency
- Privilege level
- Data sensitivity
- Customer impact
- Regulatory requirements
- Contractual requirements
- Supplier location
- Service availability requirements
5.2 Least Privilege
Suppliers should receive only the access required to perform the agreed service.
5.3 Need-to-Know
Suppliers should only access information necessary for the approved business purpose.
5.4 Security by Contract
Relevant security requirements should be incorporated into agreements, contracts, SOWs, DPAs, or other appropriate contractual documents.
5.5 Continuous Oversight
Supplier security should not be treated as a one-time onboarding activity.
5.6 Accountability
The organization retains responsibility for managing its supplier-related security risks even when services are outsourced.
6. Supplier Identification and Inventory
The organization should maintain a Supplier Register or equivalent record.
Recommended fields:
| Field | Description |
|---|---|
| Supplier ID | Unique identifier |
| Supplier Name | Legal/business name |
| Service | Service provided |
| Business Owner | Internal owner |
| Supplier Contact | Supplier contact |
| Business Process | Process supported |
| Information Accessed | Information/data |
| Classification | Information classification |
| System/Asset | Systems affected |
| Criticality | Critical/High/Medium/Low |
| Security Risk | Risk rating |
| Personal Data | Yes/No |
| Customer Data | Yes/No |
| Production Access | Yes/No |
| Privileged Access | Yes/No |
| Contract | Contract reference |
| NDA | Yes/No |
| DPA | Yes/No/NA |
| Security Assessment | Status |
| Assurance Evidence | SOC/ISO/etc. |
| Subprocessors | Yes/No |
| Data Location | Location |
| Incident Requirements | Contractual requirements |
| Review Frequency | Defined frequency |
| Last Review | Date |
| Next Review | Date |
| Status | Active/Inactive |
7. Supplier Classification
The organization should classify suppliers according to security risk.
An example model:
| Risk | Typical Characteristics |
|---|---|
| Critical | Critical systems, sensitive/customer data, privileged production access, major operational dependency |
| High | Confidential/customer data, important systems, significant business dependency |
| Medium | Internal information or important business services |
| Low | Limited information/system access and low business impact |
These categories are examples. The organization should define its own criteria.
8. Supplier Risk Assessment
Before approving a supplier, assess relevant factors.
Information Risk
- What information will the supplier access?
- What is its classification?
- Is personal data involved?
- Is customer data involved?
- Is financial information involved?
- Is restricted security information involved?
Technology Risk
- What systems will the supplier access?
- Is production access required?
- Is privileged access required?
- Does the supplier integrate with APIs?
- Does the supplier connect to cloud infrastructure?
Business Risk
- Is the service critical?
- Can the service be replaced?
- What happens if the supplier becomes unavailable?
- Is there a significant customer dependency?
Compliance Risk
Consider:
- Legal requirements
- Regulatory requirements
- Customer contractual requirements
- Privacy requirements
- Data-location requirements
- Industry requirements
9. Supplier Security Assessment
Where appropriate, suppliers should undergo security due diligence.
Assessment areas may include:
Governance
- Security policies
- Security responsibilities
- Security organization
- Risk management
- Security awareness
Access Control
- Identity management
- MFA
- Privileged access
- Access reviews
- Joiner/mover/leaver controls
Data Protection
- Encryption
- Data classification
- Data retention
- Data deletion
- Data segregation
- Backup
Infrastructure Security
- Network security
- Endpoint security
- Cloud security
- Vulnerability management
- Secure configuration
Application Security
- Secure development
- Code review
- Security testing
- Vulnerability management
- Dependency management
Incident Management
- Incident response
- Security incident notification
- Breach management
- Evidence preservation
- Customer communication
Business Continuity
- Backup
- Disaster recovery
- Business continuity
- Recovery testing
- Service availability
10. Supplier Security Assurance
Depending on supplier risk, the organization may request appropriate evidence such as:
- ISO/IEC 27001 certification
- SOC 2 report
- Independent security assessment
- Penetration testing summary
- Vulnerability assessment
- Security questionnaire
- Business continuity evidence
- Privacy/security assessment
- Relevant policies
- Security architecture information
The organization should assess whether the evidence is:
- Relevant
- Current
- Applicable to the service
- Sufficient for the identified risk
A certification or assurance report should not automatically be treated as evidence that every supplier security requirement is satisfied.
11. Supplier Approval
Supplier approval should consider:
Business Need → Security Risk → Assessment → Contractual Requirements → Approval
The supplier should not be approved solely because the business requires the service.
Approval Record
| Field | Details |
|---|---|
| Supplier | |
| Business Owner | |
| Service | |
| Risk Level | |
| Security Assessment | |
| Privacy Assessment | |
| Contract Review | |
| Security Requirements | |
| Residual Risk | |
| Approval Decision | |
| Approver | |
| Date |
12. Contractual Security Requirements
Contracts should include relevant security requirements based on supplier risk.
Requirements may address:
- Confidentiality
- Information security
- Access control
- Authentication
- Data protection
- Encryption
- Incident notification
- Vulnerability management
- Security testing
- Business continuity
- Backup
- Data retention
- Data deletion
- Data return
- Subcontractors
- Subprocessors
- Data location
- Cross-border transfers
- Security assurance
- Audit rights where appropriate
- Regulatory requirements
- Customer requirements
- Termination requirements
Not every contract requires identical wording. Requirements should reflect the supplier’s risk and service.
13. Confidentiality and NDA
Where appropriate, suppliers should be subject to confidentiality requirements.
The organization should consider:
- Information classification
- Type of information accessed
- Customer requirements
- Personal data
- Source code
- Security information
- Commercially sensitive information
Confidentiality requirements should remain effective for an appropriate period after the supplier relationship ends where required.
14. Supplier Access Control
Supplier access should follow:
Business Need → Request → Verify → Approve → Provision → Monitor → Review → Revoke
Controls may include:
- Named accounts
- MFA
- Least privilege
- Need-to-know
- Temporary access
- Access expiry
- Network restrictions
- Privileged-access controls
- Logging
- Periodic review
Shared accounts should be avoided where practical.
15. Supplier Privileged Access
Privileged supplier access should receive additional scrutiny.
Examples:
- Cloud administrator
- Database administrator
- Security administrator
- Network administrator
- Production administrator
- Managed service administrator
Check:
☐ Business justification
☐ Named individual
☐ Explicit approval
☐ MFA
☐ Minimum privilege
☐ Defined expiry where practical
☐ Monitoring/logging
☐ Periodic review
☐ Prompt revocation when no longer required
16. Supplier Access Review
Supplier access should be periodically reviewed.
The review should confirm:
- Supplier relationship remains active
- Individual remains authorized
- Internal sponsor remains valid
- Access remains necessary
- Permissions remain appropriate
- Privileged access remains justified
- Temporary access has not expired
- Former supplier personnel have been removed
- Customer/system access remains appropriate
Actual system access should be compared with approved access records.
17. Supplier Data Access
Before allowing supplier access to information, consider:
- What information is being shared?
- What is its classification?
- Why does the supplier need it?
- Who at the supplier can access it?
- How is it protected?
- Where is it stored?
- How long is it retained?
- Who are the supplier’s subprocessors?
- What happens when the relationship ends?
18. Customer Information
Suppliers processing customer information should be subject to appropriate controls.
Consider:
- Customer contractual requirements
- Data classification
- Data minimization
- Access restrictions
- Encryption
- Monitoring
- Incident notification
- Data retention
- Data deletion
- Customer notification obligations
19. Personal Data
Where suppliers process personal data, the organization should assess applicable privacy requirements.
Consider:
- Purpose of processing
- Data categories
- Data subjects
- Processing location
- Data transfers
- Retention
- Deletion
- Subprocessors
- Security measures
- Incident/breach notification
- Applicable privacy agreements
Privacy and Legal teams should be involved where required.
20. Subcontractors and Subprocessors
Suppliers should disclose relevant subcontractors or subprocessors where appropriate.
The organization should consider:
- Who they are
- What service they provide
- What information they access
- Where they operate
- What security controls apply
- Whether approval or notification is required
- How changes are communicated
- Whether downstream access is controlled
The organization should understand material downstream dependencies for critical services.
21. Cloud and SaaS Suppliers
For cloud/SaaS suppliers, consider:
- Service architecture
- Data location
- Security assurance
- Access control
- MFA
- Encryption
- Tenant isolation
- Backup
- Availability
- Incident response
- Vulnerability management
- Subprocessors
- Data deletion
- Service exit
- Business continuity
Critical SaaS applications should also be reflected in the SaaS Application Register.
22. Supplier Incident Management
Suppliers should have a defined process for reporting security incidents affecting the organization.
The contract should establish appropriate requirements for:
- Security incident notification
- Data breach notification
- Incident escalation
- Cooperation
- Evidence preservation
- Investigation
- Containment
- Customer/regulatory requirements
- Corrective action
Supplier incidents should be evaluated under the organization’s Incident Management Procedure.
23. Supplier Security Incident Workflow
Supplier Reports Incident
↓
Record Incident
↓
Assess Impact
↓
Identify Affected Information/Systems
↓
Contain and Coordinate
↓
Assess Legal/Contractual/Regulatory Requirements
↓
Investigate
↓
Remediate
↓
Verify
↓
Update Risk/Supplier Records
↓
Lessons Learned
24. Supplier Vulnerability Management
For technology suppliers, the organization should consider:
- Vulnerability disclosure process
- Security advisories
- Critical vulnerability notification
- Patch management
- Security testing
- Dependency vulnerabilities
- Product vulnerabilities
- Cloud service vulnerabilities
Relevant supplier security information should feed into the organization’s vulnerability, risk, and threat-intelligence processes.
25. Supplier Change Management
Material supplier changes should be assessed.
Examples:
- New hosting location
- New subprocessor
- Major architecture change
- Change in ownership
- Change in service
- Change in data processing
- Change in security controls
- New production access
- Significant change in contractual terms
Process
Supplier Change → Assess Impact → Reassess Risk → Update Controls/Contract → Approve → Record
26. Supplier Performance Monitoring
Where appropriate, monitor supplier security performance.
Possible metrics:
- Security incidents
- SLA breaches
- Security findings
- Vulnerability remediation
- Audit findings
- Assessment completion
- Access-review completion
- Business continuity test results
- Security notification performance
- Contract compliance
Monitoring should be proportionate to supplier risk.
27. Supplier Periodic Review
Supplier reviews should consider:
Business
- Service still required
- Service performance
- Business criticality
- Dependency
Security
- Security incidents
- Assessment results
- Security assurance
- Vulnerabilities
- Access reviews
Compliance
- Contractual requirements
- Regulatory changes
- Privacy requirements
- Customer requirements
Continuity
- Availability
- Backup
- Recovery capability
- Exit arrangements
28. Supplier Risk Reassessment
Supplier risk should be reassessed when significant changes occur.
Triggers may include:
- New service
- New data
- New customer requirement
- New regulatory requirement
- Security incident
- Major vulnerability
- Supplier acquisition/change of ownership
- New subprocessor
- Change in data location
- Production access
- Privileged access
- Service criticality change
29. Supplier Security Review Record
| Field | Details |
|---|---|
| Supplier | |
| Review ID | |
| Review Date | |
| Reviewer | |
| Risk Level | |
| Service | |
| Information | |
| Security Assessment | |
| Incidents | |
| Changes | |
| Assurance Evidence | |
| Access Review | |
| Open Findings | |
| Residual Risk | |
| Required Actions | |
| Next Review |
30. Supplier Findings and Corrective Actions
| Finding ID | Supplier | Finding | Risk | Action | Owner | Due Date | Status |
|---|---|---|---|---|---|---|---|
Actions may include:
- Request additional evidence
- Reduce supplier access
- Require remediation
- Update contract
- Add security control
- Conduct additional assessment
- Escalate risk
- Suspend access
- Review supplier relationship
31. Supplier Exceptions
Where supplier security requirements cannot be fully met, the exception should be formally evaluated.
| Exception ID | Supplier | Requirement | Reason | Risk | Compensating Control | Approver | Expiry |
|---|---|---|---|---|---|---|---|
Exceptions should not become indefinite alternatives to implementing required security controls.
32. Critical Supplier Management
Critical suppliers should receive enhanced oversight appropriate to their risk.
Consider:
- More detailed due diligence
- Contractual security requirements
- Security assurance
- Periodic reassessment
- Business continuity review
- Incident notification
- Subprocessor visibility
- Access review
- Exit planning
- Concentration/dependency risk
- Management reporting
33. Supplier Business Continuity
For critical suppliers, assess:
- Service availability
- Backup arrangements
- Disaster recovery
- Recovery objectives
- Recovery testing
- Alternative suppliers
- Data recovery
- Service dependency
- Exit strategy
The organization should understand how supplier failure could affect its own business continuity.
34. Supplier Termination
When a supplier relationship ends:
☐ Service termination confirmed
☐ Supplier access identified
☐ User accounts disabled
☐ Privileged access revoked
☐ Cloud access revoked
☐ VPN access removed
☐ SaaS access removed
☐ Customer-system access removed
☐ API keys/tokens addressed
☐ Information returned where required
☐ Information securely deleted where required
☐ Subprocessor access addressed
☐ Assets returned
☐ Credentials/secrets rotated where necessary
☐ Contracts closed
☐ Supplier Register updated
☐ Security evidence retained
☐ Exit verified
35. Supplier Exit and Data Deletion
Where required by contract or applicable requirements, the organization should obtain appropriate evidence of:
- Data return
- Data deletion
- Backup deletion where applicable
- Account closure
- Access revocation
- Asset return
- Subprocessor termination
The exact deletion/return requirements should be defined contractually where appropriate.
36. Supplier Security Roles
Management
- Approve supplier-security governance
- Provide resources
- Review significant supplier risks
Supplier/Procurement Owner
- Maintain supplier relationship
- Coordinate contractual requirements
- Ensure supplier records remain current
Business Owner
- Define business need
- Understand supplier dependency
- Approve business use
Security/ISMS
- Define security requirements
- Assess supplier security risk
- Review security evidence
- Monitor security issues
IT/Cloud
- Control technical access
- Implement security configurations
- Monitor technical dependencies
Legal/Privacy
- Review contracts
- Assess legal/privacy requirements
- Review data-processing requirements
System/Data Owner
- Approve information/system access
- Define security requirements
- Review supplier access
37. Supplier Security Evidence
Evidence may include:
- Supplier Register
- Supplier Risk Assessment
- Security questionnaire
- Security assessment
- ISO 27001 certificate
- SOC 2 report
- Penetration-testing evidence
- Security policies
- Contract/SOW
- NDA
- DPA
- Security schedule
- Access approvals
- Access reviews
- Incident records
- Vulnerability notifications
- Business continuity evidence
- Corrective-action records
- Supplier review records
- Data deletion/return evidence
38. Supplier Security Metrics
The organization may track:
| Metric | Result |
|---|---|
| Total Suppliers | |
| Critical Suppliers | |
| High-Risk Suppliers | |
| Suppliers Assessed | |
| Assessments Overdue | |
| Contracts With Security Requirements | |
| Suppliers With Security Assurance | |
| Supplier Incidents | |
| Open Supplier Findings | |
| Overdue Corrective Actions | |
| Supplier Access Reviews Completed | |
| Suppliers With Subprocessors | |
| Supplier Terminations Completed |
39. Startup-Friendly Supplier Security Model
A startup does not need a complex supplier-management platform to establish effective controls.
Start with five records:
1. Supplier Register
Know who your suppliers are.
2. Supplier Risk Assessment
Understand which suppliers create significant risk.
3. Supplier Security Assessment
Assess important suppliers.
4. Supplier Contract Security Requirements
Make security requirements contractual where appropriate.
5. Supplier Review Record
Periodically review important suppliers.
Minimum Flow
Supplier Identified
→ Business Need
→ Risk Classification
→ Security Assessment
→ Contract/Security Requirements
→ Approval
→ Access/Data Provisioning
→ Monitoring
→ Periodic Review
→ Termination
40. AWS SaaS Startup Example
Consider a SaaS startup using:
- AWS
- GitHub
- Microsoft 365
- Jira
- Customer support SaaS
- Payment provider
- External VAPT provider
The organization should not treat every supplier identically.
AWS
High/critical dependency because it hosts production services.
Review:
- Security assurance
- Availability
- Data protection
- Access
- Incident response
- Backup/recovery
- Shared responsibility
GitHub
Review:
- Source-code security
- Identity/MFA
- Repository access
- Security assurance
- Availability
- Incident handling
VAPT Provider
Review:
- Scope
- Personnel
- Confidentiality
- Access
- Testing methodology
- Data handling
- Report protection
- Access revocation
Payment Provider
Review:
- Payment data
- Security assurance
- Regulatory/contractual requirements
- Incident notification
- Availability
- Data handling
The level of review should reflect each supplier’s actual risk and business dependency.
41. Supplier Security Risk Trail
Supplier management should connect:
Supplier
↓
Service
↓
Information/Asset
↓
Access
↓
Risk
↓
Security Requirements
↓
Contract
↓
Controls
↓
Evidence
↓
Monitoring
↓
Review
↓
Exit
This creates a clear audit trail from the business relationship to the associated security controls.
42. Common Supplier Security Mistakes
Avoid:
- Maintaining suppliers only in a procurement spreadsheet.
- Failing to identify critical suppliers.
- Treating all suppliers identically.
- Approving suppliers without security assessment where risk warrants one.
- Relying only on supplier certifications.
- Failing to understand what data the supplier accesses.
- Ignoring subcontractors/subprocessors.
- Allowing unnecessary supplier access.
- Failing to include security requirements in contracts.
- Ignoring supplier incidents.
- Failing to review supplier changes.
- Failing to reassess supplier risk.
- Failing to plan supplier exit.
- Failing to revoke supplier access after termination.
- Failing to verify data return/deletion where required.
43. Relationship With Other ISMS Documents
| Document | Relationship |
|---|---|
| Supplier Register | Master supplier population |
| Supplier Security Assessment | Detailed security due diligence |
| Supplier Risk Assessment | Determines supplier risk |
| Supplier Security Review | Periodic monitoring |
| Third-Party Access Procedure | Controls supplier access |
| Contractor Account Procedure | Controls contractor accounts |
| SaaS Application Register | Tracks SaaS suppliers |
| Cloud Asset Inventory | Tracks cloud services/assets |
| External Data Sharing Procedure | Controls supplier data sharing |
| Third-Party Information Sharing Agreement | Defines information-sharing requirements |
| Access Rights Register | Records supplier permissions |
| Privileged Access Register | Records supplier privileged access |
| Incident Management | Handles supplier incidents |
| Threat Intelligence Procedure | Monitors supplier-related threats |
| Risk Register | Records significant supplier risks |
| Business Continuity | Addresses critical supplier dependency |
| Contract Management | Controls contractual obligations |
44. ISO 27001 Connection
Supplier security management supports the organization’s implementation of controls relating to:
- Supplier relationships
- Supplier agreements
- ICT supply-chain security
- Monitoring and review of supplier services
- Information transfer
- Access control
- Incident management
- Business continuity
- Information classification
- Data protection
- Risk management
The exact controls applicable to the organization should be determined through its risk assessment and Statement of Applicability (SoA).
Supplier security should be integrated into the broader ISMS rather than maintained as a separate procurement-only process.
45. Quick Audit Checklist
Supplier Identification
☐ Supplier identified
☐ Service documented
☐ Business owner assigned
☐ Criticality assessed
☐ Information identified
☐ Systems identified
Risk
☐ Supplier risk assessed
☐ Data sensitivity considered
☐ Production access considered
☐ Privileged access considered
☐ Business dependency considered
☐ Regulatory requirements considered
Due Diligence
☐ Security assessment completed where required
☐ Assurance evidence reviewed
☐ Subprocessors considered
☐ Business continuity considered
Contract
☐ NDA/confidentiality
☐ Security requirements
☐ Incident notification
☐ Data protection
☐ Access requirements
☐ Data return/deletion
☐ Subprocessor requirements
☐ Termination requirements
Access
☐ Named accounts
☐ Least privilege
☐ MFA where required
☐ Privileged access controlled
☐ Periodic access review
☐ Access revoked when no longer required
Monitoring
☐ Supplier incidents monitored
☐ Security changes monitored
☐ Assurance evidence reviewed
☐ Findings tracked
☐ Risk reassessed
Exit
☐ Access revoked
☐ Data returned/deleted where required
☐ Subprocessor access addressed
☐ Credentials/secrets addressed
☐ Supplier record updated
☐ Exit evidence retained
46. Final Audit Trail
For each significant supplier, the organization should be able to demonstrate:
Why was the supplier engaged?
What service does the supplier provide?
What information and systems can it access?
What security risks does the supplier introduce?
What security assessment was performed?
What security requirements were included in the agreement?
Who approved the supplier?
How is supplier access controlled?
How is supplier security monitored?
How are incidents and changes handled?
When was the supplier last reviewed?
What happens when the relationship ends?
Final Principle
A supplier relationship is also a security relationship. Know what the supplier provides, what information and systems it can access, what risks it introduces, what security requirements apply, how those requirements are monitored, and how access and information are securely handled when the relationship ends.