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5.4
Umbraco Backoffice API Allows Unauthorized Domain Changes
CVE-2026-31832
GHSA-fpvf-fvp5-996r
GHSA-fpvf-fvp5-996r
Summary
A security issue in the Umbraco backoffice API allows anyone with an account to modify domain settings for content they shouldn't be able to edit. This could lead to incorrect routing, website disruption, or accidental exposure of sensitive information. To fix this, update to version 16.5.1 or 17.2.2.
What to do
- Update umbraco.cms to version 16.5.1.
- Update umbraco.cms to version 17.2.2.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| – | umbraco.cms | > 14.0.0 , <= 16.5.1 | 16.5.1 |
| – | umbraco.cms | > 17.0.0 , <= 17.2.2 | 17.2.2 |
Original title
Umbraco Backoffice API Allows Unauthorized Modification of Domain Data
Original description
### Description
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).
### Impact
An attacker can modify domain configurations for content nodes they are not permitted to edit. This may result in malicious or unintended routing behaviour, service disruption, and potential disclosure of configuration-related information.
### Patches
The issue is patched in 16.5.1 and 17.2.2.
### Workarounds
There is no workaround other than upgrading.
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).
### Impact
An attacker can modify domain configurations for content nodes they are not permitted to edit. This may result in malicious or unintended routing behaviour, service disruption, and potential disclosure of configuration-related information.
### Patches
The issue is patched in 16.5.1 and 17.2.2.
### Workarounds
There is no workaround other than upgrading.
nvd CVSS3.1
5.4
Vulnerability type
CWE-639
Authorization Bypass Through User-Controlled Key
Published: 11 Mar 2026 · Updated: 13 Mar 2026 · First seen: 10 Mar 2026