How severe is CVE-2026-34210?

CVE-2026-34210 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2026-34210 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34210?

CVE-2026-34210 affects Wevm Mppx. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34210?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-34210 have an EU (EUVD) identifier?

Yes. CVE-2026-34210 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17457.

When was CVE-2026-34210 published?

CVE-2026-34210 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-34210

CVE-2026-34210 is a high-severity vulnerability in Wevm Mppx with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-697.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v4: 6.0
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17457
Weakness: CWE-697
Affected product: Wevm Mppx
Published: 2026-03-31
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-34210?: CVE-2026-34210 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2026-34210 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34210?: CVE-2026-34210 affects Wevm Mppx. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34210?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-34210 have an EU (EUVD) identifier?: Yes. CVE-2026-34210 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17457.
When was CVE-2026-34210 published?: CVE-2026-34210 was published on 2026-03-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:wevm:mppx:*:*:*:*:*:node.js:*:*

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