Third-Party Vendor Risks: Vetting vendors and their security practices

  • JUNE 23RD, 2025
  • 2min read
Third-Party Vendor Risks: Vetting vendors and their security practices

As organisations increasingly rely on third-party vendors for software, services, and infrastructure, the security posture of your vendors becomes an extension of your own. A weak link in a third-party’s environment can expose your organisation to data breaches, compliance violations, or operational disruptions. A good example is Solarwinds supply chain attack where they penetrated the system of a third-party supplier with access to their targets’ network assets.

Key Risks Introduced by Third-Party Vendors

  • Insufficient Security Controls: Lack of encryption, patch management, or identity/access policies.

  • Data Exposure: Mishandling or unauthorised access to sensitive or regulated data.

  • Supply Chain Attacks: Malicious code or backdoors introduced through vendor software updates.

  • Access Mismanagement: Over-permissioned vendor accounts with weak authentication.

  • Regulatory Non-Compliance: Vendors failing to meet standards like GDPR, HIPAA, or ISO 27001.

Best Practices for Managing Third Party Vendor Risks

  • Service Level Agreements (SLAs): Vendor contracts must detail performance, timeliness, and quality standards (SLAs) for their services, including potential penalties for non-compliance.

  • Right to Audit: This should allow you to inspect the vendor’s processing facilities as well.

  • Information Security Practices: Verify the vendor’s documented information security policies, including access management and data handling practices like encryption, storage, transfer, and data destruction.

  • Compliance: Vendors must hold necessary licenses and adhere to regulatory and internal requirements for their activities.

  • Incident Response Planning: Ensure vendors have defined incident response procedures and Include vendors in your own response and notification workflows.

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Third-Party Vendor Risks: Vetting vendors and their security practices

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