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Authenticating a Webhook Isn't Validating It: A Payment-Bypass Lesson (CVE-2026-9189)
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Authenticating a Webhook Isn't Validating It: A Payment-Bypass Lesson (CVE-2026-9189)
If your app receives webhooks (Stripe, PayPal, GitHub, a payment IPN, anything), there is a subtle bug class that keeps shipping to production. A recent WordPress CVE is a perfect, minimal teaching example, so let's use it to make sure none of us write it. The pattern (this is the part to remember) Authenticating a webhook = "this message really came from the provider" Validating a webhook = "the data in this message matches what I expect" Doin…
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