Google Workspace 2025 OAuth Supply Chain Breach: Lessons From the Drift Incident
In August 2025, a supply chain attack targeted Google Workspace via compromised OAuth tokens associated with the Drift email integration, impacting several organizations. Attackers leveraged stolen Drift tokens to gain unauthorized, delegated access to connected Google Workspace mailboxes, bypassing traditional security controls by exploiting trusted third-party app grants. Google rapidly responded on August 9 by revoking the affected tokens and disabling the integration. While only a small number of mailboxes were directly accessed, the incident underscored how attackers increasingly exploit SaaS interconnections rather than direct platform breaches. This incident is particularly relevant today as exploitation of OAuth tokens and third-party integrations continues to climb, representing a paradigm shift in enterprise attack surfaces. It highlights the growing need for comprehensive SaaS integration visibility, rigorous token governance, and real-time behavioral monitoring as attackers increasingly favor these stealthy, scalable techniques.
Kill Chain
