What is CVE-2026-89411?

CVE-2026-89411 is a medium-severity vulnerability in Paymattic, classified under CWE-345 INSUFFICIENT VERIFICATION OF DATA AUTHENTICITY. CVSS score: 5.3/10. Published 2026-09-28.

How severe is CVE-2026-89411?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Paymattic

CVE-2026-89411

The Paymattic WordPress plugin from 4.6.20 before 4.6.26 does not verify that a confirmed Stripe payment belongs to the order it is applied to, allowing unauthenticated users to mark an arbitrary pending order as paid by confirming a smaller payment of their own against it.

Published 2026-09-28.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Paymattic

References

wpscan.com/vulnerability/240a0440-7892-4c03-b282-2fdb6f086bb6/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-89411?: CVE-2026-89411 is a medium-severity vulnerability in Paymattic, classified under CWE-345 INSUFFICIENT VERIFICATION OF DATA AUTHENTICITY. CVSS score: 5.3/10. Published 2026-09-28.
How severe is CVE-2026-89411?: Medium severity. CVSS v3 base score is 5.3 out of 10.