Why SPIFFE Agent Identities Can Still Be Replayed, and How WIMSE Fixes It
SPIFFE has become the default way to give AI agents a workload identity, a short-lived, cryptographically verifiable credential that answers which specific agent process is acting right now. It has real production deployments behind it at companies like Uber, Stripe, and Netflix, and it shows up in nearly every serious piece written about agent security this year. What most of that coverage skips is a specific, fixable gap in how SPIFFE tokens actually work. A SPIFFE token is a bearer token.
Whoever holds it can present it, whether or not they are the workload it was actually issued to. If someone intercepts that token in transit, they can replay it, and nothing in SPIFFE itself stops them. That gap has existed since SPIFFE's earliest design decisions, and this year it finally started closing.
Bootstrapping Was Never the Whole Problem
SPIFFE was built to answer one specific question well: how does...
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