CVE-2026-66003 Frappe: Access control bypass via REST API dot-notation fields on linked doctypes
Low-privileged users can bypass access controls to read unauthorized data from linked records via the REST API in the Frappe framework.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-66003?
CVE-2026-66003 is a high-severity missing authorization vulnerability in frappe, published on 26 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Frappe is a full-stack web application framework written in Python and JavaScript. Prior to version 15.115.0, an access control bypass in the REST API allows a user to read data from Linked DocTypes that they are not authorized to access. When a document references another document through a Link field, the framework does not consistently enforce the linked DocType's own permissions when the record is retrieved through the REST API, so a low-privileged authenticated user can obtain fields from linked records outside their permitted scope. This issue is fixed in version 15.115.0.
Weakness: CWE-863
Which versions are affected by CVE-2026-66003?
How do I fix CVE-2026-66003?
No fix has been published for CVE-2026-66003 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-66003 being exploited?
There is no known exploitation of CVE-2026-66003 in the wild and no public exploit code.
Sources
Also known as GHSA-p25m-7rvg-6fvr.