One Employee. One OAuth Token. The Vercel Breach Explained
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- 20 Apr 2026
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Discussion of the blog article One Employee. One OAuth Token. The Vercel Breach Explained.
Vercel confirmed a security breach on April 18-19, 2026, tracing back to a compromised third-party AI tool and a single employee's Google Workspace connection. Here is the full attack chain, what was actually exposed, and what you need to do right now.
Discussion thread — share findings, corrections and follow-ups below.