CVE-2026-31832CWE-639

Umbraco Backoffice API Allows Unauthorized Modification of Domain Data

Medium · published March 10, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
21.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00298 · 21.4th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-03-10T21:49Z
EPSS history
Timeline
  • 10 MAR 21:49Z
    Umbraco Backoffice API Allows Unauthorized Modification of Domain Data
    cvelistv5