What is CVE-2026-89289?

CVE-2026-89289 is a medium-severity vulnerability in Fast Courier, classified under Missing Authorization. CVSS score: 5.3/10. Published 2026-10-06.

How severe is CVE-2026-89289?

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

Auth bypass in Fast Courier

CVE-2026-89289

The Fast Courier WordPress plugin through 5.2.3 does not restrict an unauthenticated REST route that writes order fulfillment data, allowing unauthenticated attackers to overwrite the courier status and customer-facing tracking details of any WooCommerce order by supplying its id.

Vulnerability class: Broken Access Control

Published 2026-10-06 · last modified 2026-10-06.

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

Fast Courier

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

wpscan.com/vulnerability/716b6d58-a816-43f2-8a1a-b9fe4f2f9d1d/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-89289?: CVE-2026-89289 is a medium-severity vulnerability in Fast Courier, classified under Missing Authorization. CVSS score: 5.3/10. Published 2026-10-06.
How severe is CVE-2026-89289?: Medium severity. CVSS v3 base score is 5.3 out of 10.