Moderate severityNVD Advisory· Published Mar 10, 2026· Updated Mar 11, 2026
Umbraco Backoffice API Allows Unauthorized Modification of Domain Data
CVE-2026-31832
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
Umbraco.CmsNuGet | >= 14.0.0, < 16.5.1 | 16.5.1 |
Umbraco.CmsNuGet | >= 17.0.0, < 17.2.2 | 17.2.2 |
Affected products
1- Range: >= 14.0.0, < 16.5.1
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
3- github.com/advisories/GHSA-fpvf-fvp5-996rghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-31832ghsaADVISORY
- github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-fpvf-fvp5-996rghsax_refsource_CONFIRMWEB
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