Third-party breaches are on the rise. We discuss the importance of rigorous vendor audits and how to implement a Zero Trust approach to your supply chain.
Your security perimeter extends far beyond your firewalls. It includes every SaaS provider, cloud host, and software library you use. 2025 has been the year of the "Supply Chain Attack," with high-profile breaches originating from compromised third-party vendors.
The Shift to "Continuous Verification"
The annual vendor questionnaire is dead. It provides a snapshot in time that is outdated the moment it is submitted. Leading organizations are shifting to Continuous Monitoring. This involves using automated tools to scan vendors' external attack surfaces and monitor for compromised credentials on the dark web in real-time.
Implementing Zero Trust for Vendors
Do not grant vendors broad access to your network. Implement key Zero Trust principles:
- Least Privilege: Vendors should only access the specific applications and data needed to fulfill their contract.
- Just-in-Time Access: Grant access only when needed, for a specific time window, and revoke it immediately after.
- Session Recording: Monitor and record privileged sessions by third parties to ensure accountability.
Trust, but verify. And then verify again.
Written by Sarah Jenkins, GRC Specialist
Offensive Security Practitioners & ISO 27001 Auditors
Whitesec AU is an accredited Australian cybersecurity firm providing VAPT, Essential Eight gap analysis, CPS 234 compliance, and vCISO governance out of Perth, WA.