Vulnerability · Published Mar 31, 2026 · Assigned by GitHub_M

CVE-2026-34210mppx has Stripe charge credential replay via missing idempotency check

Medium 6.0

In plain English

A medium-severity security flaw in mppx from wevm. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.0Medium

Exploit odds (30 days)0.5%top 56.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	mppx	0.4.11	GHSA-8mhj-rffc-rcvw

Affected products (as reported)

Vendor	Product	Versions
wevm	mppx	< 0.4.11

Weakness: CWE-697 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

References

https://github.com/wevm/mppx/security/advisories/GHSA-8mhj-rffc-rcvw x_refsource_CONFIRM
https://github.com/wevm/mppx/commit/b2b1a0b60506fc71aa80b8a025084949dca1a994 x_refsource_MISC
https://github.com/wevm/mppx/releases/tag/mppx@0.4.11 x_refsource_MISC