CVE-2026-31832

Umbraco Backoffice API Allows Unauthorized Modification of Domain Data

State: Published
Severity: 5.4 Medium
Published: Mar 10, 2026
Updated: Mar 11, 2026
Reserved: Mar 9, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L	GitHub_M

Weaknesses

CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
Umbraco-CMSumbraco	>= 14.0.0, < 16.5.1Affected >= 17.0.0, < 17.2.0Affected

References

https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-fpvf-fvp5-996r

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