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TI-2026-24385 Aliases CVE-2026-31832GHSA-fpvf-fvp5-996r

Umbraco Backoffice API Allows Unauthorized Modification of Domain Data

Priority LOW 24CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-639.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00208 11th percentileScored 2026-11-07
Fix Fixed Umbraco-CMS (umbraco): 16.5.1, 17.2.0Umbraco.Cms (NuGet): 16.5.1, 17.2.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
umbracoUmbraco-CMS14.0.0 to before 16.5.1; 17.0.0 to before 17.2.016.5.1, 17.2.0Patch availableCNA
—Umbraco.Cms (NuGet)14.0.0 to before 16.5.116.5.1Patch availableGHSA-fpvf-fvp5-996r
—Umbraco.Cms (NuGet)17.0.0 to before 17.2.217.2.2Patch availableGHSA-fpvf-fvp5-996r
  • Umbraco-CMS Vendorumbraco Affected 14.0.0 to before 16.5.1; 17.0.0 to before 17.2.0 Fixed in 16.5.1, 17.2.0 Patch available CNA
  • Umbraco.Cms (NuGet) Vendor— Affected 14.0.0 to before 16.5.1 Fixed in 16.5.1 Patch available GHSA-fpvf-fvp5-996r
  • Umbraco.Cms (NuGet) Vendor— Affected 17.0.0 to before 17.2.2 Fixed in 17.2.2 Patch available GHSA-fpvf-fvp5-996r

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:*14.0.0 to before 16.5.1; 17.0.0 to before 17.2.2Vulnerableumbraco
  • cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:* Versions 14.0.0 to before 16.5.1; 17.0.0 to before 17.2.2 Vulnerable ·umbraco

Remediation

  • Fix · CNA Umbraco-CMS (umbraco) Fixed in 16.5.1, 17.2.0
  • Fix · GHSA-fpvf-fvp5-996r Umbraco.Cms (NuGet) Fixed in 16.5.1 Advisory →
  • Fix · GHSA-fpvf-fvp5-996r Umbraco.Cms (NuGet) Fixed in 17.2.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-31832
  2. 2026-10-03 Alias added: GHSA-fpvf-fvp5-996r

References

Advisory 2

Other 1

  • TI-2025-41183 An arbitrary file upload vulnerability in Umbraco CMS v16.3.3 allows attackers to execute… CVSS 3.1CRITICAL 10.0
  • TI-2012-05477 Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE CVSS 4.0CRITICAL 9.3
  • TI-2021-22392 Umbraco v8.14.1 - 'baseUrl' SSRF CVSS 4.0MEDIUM 6.9
  • TI-2024-36846 A stored cross-site scripting (XSS) vulnerability in Umbraco CMS v14.3.1 allows attackers… CVSS 3.1MEDIUM 6.5
  • TI-2019-15240 Umbraco CMS 4.11.8 through 7.15.10, and 7.12.4, allows Remote Code Execution by… CVSS 3.1HIGH 7.2
  • TI-2020-04738 Cross-site scripting in Umbraco CMS CVSS 3.1MEDIUM 5.4
See all 56 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences