Stripe Webhooks: Signature Replay Attacks & Timestamp Clock Drift
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Public Syllabus OverviewCryptography & Webhooks · undefined
Stripe Webhooks: Signature Replay Attacks & Timestamp Clock Drift: An e-commerce merchant using Stripe webhooks verified HMAC SHA-256 signatures, but omitted the timestamp header comparison. An attacker intercepted an authentic `customer.subscription.deleted` webhook and replayed it 8 months later, maliciously canceling subscriptions for 50,000 paying users.