In short
- CVE-2026-34210 is a HIGH (CVSS 8.1) vulnerability affecting mppx (wevm), mppx.
- Chance of exploitation in the next 30 days (EPSS): 0.51%, higher than 43.7% of all vulnerabilities.
- Fix: update to 0.4.11 or later.
| Package | Affected versions | Patched versions |
|---|
| mppx | < 0.4.11
| 0.4.11
|
| mppx npm | < 0.4.11
| 0.4.11
|
Description
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.
NVD description
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.
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