CVE-2026-31832 MEDIUM

CVE-2026-31832: Umbraco Backoffice API Allows Unauthorized Modification of Domain Data

Vendor Umbraco
Product Umbraco-CMS
Weakness CWE-639 · IDOR
Published March 10, 2026
Last update March 11, 2026

CVSS base score

5.4/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

What the vulnerability does

01Description

Umbraco is an ASP.NET CMS. From 14.0.0 to before 16.5.1 and 17.2.2, A broken object-level authorization vulnerability exists in a backoffice API endpoint that allows authenticated users to assign domain-related data to content nodes without proper authorization checks. The issue is caused by insufficient authorization enforcement on the affected API endpoint, whereby via an API call, domains can be set on content nodes that the editor does not have permission to access (either via user group privileges or start nodes). This vulnerability is fixed in 16.5.1 and 17.2.2.

Key dates

02Disclosure timeline

March 10, 2026 CVE published
March 11, 2026 Record updated