CVE-2026-34210

mppx is a TypeScript interface for machine payments protocol. Prior to version 0.4.11, the stripe/charge payment method did not check Stripe's Idempotent-Replayed response header when creating PaymentIntents. An attacker could replay a valid credential containing the same spt token against a new challenge, and the server would accept the replayed Stripe PaymentIntent as a new successful payment without actually charging the customer again. This allowed an attacker to pay once and consume unlimited resources by replaying the credential. This issue has been patched in version 0.4.11.

• CWE-697

• https://github.com/wevm/mppx/commit/b2b1a0b60506fc71aa80b8a025084949dca1a994Patch
• https://github.com/wevm/mppx/releases/tag/mppx@0.4.11Release Notes
• https://github.com/wevm/mppx/security/advisories/GHSA-8mhj-rffc-rcvwPatch, Vendor Advisory

Published

Mar 31, 2026

Last Modified

Jul 24, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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