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CVE-2026-31832 — Vulnerability in Umbraco.Cms — CVE Details

MEDIUM

Umbraco Backoffice API Allows Unauthorized Modification of Domain Data

Published March 11, 2026Updated March 13, 2026Source: osv

Summary

### 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.

Advisory Timeline

  • First published March 11, 2026 (215 days ago).
  • Last revised March 13, 2026 — 2 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet
Update Umbraco.Cms to 16.5.1 or later
dotnet add package Umbraco.Cms --version 16.5.1
NuGet
Update Umbraco.Cms to 17.2.2 or later
dotnet add package Umbraco.Cms --version 17.2.2

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

Affects 1 ecosystem: nuget (1).

PackageEcosystemAffectedFixed In
Umbraco.Cms
nuget
14.0.0, 14.1.0, 14.1.0-rc, 14.1.0-rc2 (+66 more)16.5.1
Umbraco.Cms
nuget
17.0.0, 17.0.1, 17.0.2, 17.1.0 (+5 more)17.2.2

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-639
    Insecure Direct Object Reference (IDOR)MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 5.4 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low

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

References

Frequently Asked Questions

What is CVE-2026-31832?
Umbraco Backoffice API Allows Unauthorized Modification of Domain Data This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 5.4/10).
How do I check if my project is affected by CVE-2026-31832?
CVE-2026-31832 affects Umbraco.Cms. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-31832 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
5.4

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-fpvf-fvp5-996r

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