What is CVE-2026-109666?

CVE-2026-109666 is a medium-severity vulnerability in Frappe Erpnext, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-10-12.

How severe is CVE-2026-109666?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Frappe Erpnext

CVE-2026-109666

Frappe ERPNext before 15.110.0 and 16.x before 16.21.0 contains a missing authorization vulnerability in certain endpoints that fail to enforce proper permission checks on inventory records. Authenticated users can send requests to these endpoints to modify inventory data beyond what their assigned role permits.

Vulnerability class: Broken Access Control

Published 2026-10-12 · last modified 2026-10-12.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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

Frappe Erpnext

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

github.com/frappe/erpnext/security/advisories/GHSA-6rgf-xx2m-fjr2 (vendor-advisory)
www.vulncheck.com/advisories/frappe-erpnext-before-15.110.0-missing-authorizati… (third-party-advisory)

Frequently asked questions

What is CVE-2026-109666?: CVE-2026-109666 is a medium-severity vulnerability in Frappe Erpnext, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-10-12.
How severe is CVE-2026-109666?: Medium severity. CVSS v3 base score is 6.5 out of 10.