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EUVD-2026-278346

fkie_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.

GHSA-8mhj-rffc-rcvw — mppx has Stripe charge credential replay via missing idempotency check

Affected: npm: mppx

### Impact

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.

### Patches

Fixed in 0.4.11. The server now checks the `Idempotent-Replayed` header and rejects replayed PaymentIntents.

### Workarounds

There are no workarounds available for this vulnerability.