The Authorization Abuse Epidemic: Why Permit2 Signature Phishing Is Now Crypto's Deadliest Attack Vector

The Numbers Don't Lie: Code Exploits Are Losing to Social Engineering Something shifted in crypto security in early 2026 — and most builders haven't noticed yet. According to NOMINIS's monthly intelligence reports, authorization abuse — not smart contract exploits — is now the primary attack surface in crypto. In January 2026, a single phishing attack involving malicious token approvals accounted for $282 million, roughly 75% of all crypto losses that month. February's $49.3 million in losses told the same story: the Step Finance compromise, caused by executive device compromise leading to malicious transaction approvals, represented over 60% of the month's damage. The uncomfortable truth? We've gotten good at auditing contracts. Reentrancy guards, formal verification, invariant testing — all battle-tested. But the industry's collective blind spot is the user-facing authorization layer: the moment a human signs something in their wallet. This article dissects how Permit2 signature phis