---
id: CVE-2026-34210
title: mppx is a TypeScript interface for machine payments protocol
summary: >-
  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 v…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H'
cwe:
  - CWE-697
vendor: wevm
product: mppx
affected:
  - mppx < 0.4.11
patched:
  - mppx 0.4.11
published: '2026-03-31'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-34210'
references:
  - url: >-
      https://github.com/wevm/mppx/commit/b2b1a0b60506fc71aa80b8a025084949dca1a994
    label: security-advisories@github.com
  - url: 'https://github.com/wevm/mppx/releases/tag/mppx@0.4.11'
    label: security-advisories@github.com
  - url: 'https://github.com/wevm/mppx/security/advisories/GHSA-8mhj-rffc-rcvw'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00494
epssPercentile: 0.41487
ingestedAt: '2026-07-24T21:39:13.427Z'
---

## Overview

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.

## Affected

- `mppx < 0.4.11`

## Remediation

Upgrade past the affected range:

- `mppx 0.4.11`