Is CVE-2026-109666 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-109666 being exploited in the wild.

How severe is CVE-2026-109666?

Medium severity, with a CVSS score of 6.5, published 12 October 2026.

Which products and versions are affected?

Frappe ERPNext before 15.110.0, 16.x before 16.21.0.

Is there a fix for CVE-2026-109666?

Yes: fixed in ERPNext 15.110.0, 16.21.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-109666 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-109666?

Check whether you run Frappe ERPNext at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-109666: Frappe ERPNext missing authorization in inventory endpoints

CVE-2026-109666 · Severity: medium · CVSS 6.5 · Published 2026-10-12

Frappe ERPNext is an open-source enterprise resource planning system that manages business operations including inventory. A missing authorization vulnerability allows authenticated users to modify inventory data beyond their assigned permissions, potentially causing inventory mismanagement or data corruption. An attacker with any user account could alter stock levels, product records, or other inventory data they should not have access to.

Technologies: Frappe ERPNext. Vendors: Frappe.

Quick answers

Is CVE-2026-109666 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-109666 being exploited in the wild.
How severe is CVE-2026-109666?: Medium severity, with a CVSS score of 6.5, published 12 October 2026.
Which products and versions are affected?: Frappe ERPNext before 15.110.0, 16.x before 16.21.0.
Is there a fix for CVE-2026-109666?: Yes: fixed in ERPNext 15.110.0, 16.21.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-109666 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-109666?: Check whether you run Frappe ERPNext at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: ERPNext 15.110.0, 16.21.0

Technical details

The vulnerability is a missing authorization check (CWE-862) in certain API endpoints that handle inventory records. Authenticated users can send network requests to these endpoints without proper permission validation, allowing privilege escalation to modify inventory data beyond their role's scope. The attack requires valid credentials but no user interaction, and is fixed in ERPNext 15.110.0 and 16.21.0.

Affected products

Frappe ERPNext before 15.110.0, 16.x before 16.21.0

Timeline

2026-08-13: disclosed
2026-10-12: advisory

References

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