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CVE-2026-31832— Umbraco Backoffice API Allows Unauthorized Modification of Domain Data

Quick assessment

Affected
umbraco Umbraco-CMS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Umbraco是丹麦Umbraco公司的一套C#编写的开源的内容管理系统（CMS）。 Umbraco 14.0.0版本至16.5.1之前版本和17.2.2之前版本存在安全漏洞，该漏洞源于后台API端点授权执行不足，可能导致未经授权设置内容节点域。

CVSS 5.4 · Medium EPSS 0.29% · P19

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token
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I. Basic Information for CVE-2026-31832

Vulnerability Information
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Vulnerability Title
Umbraco Backoffice API Allows Unauthorized Modification of Domain Data
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Umbraco 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Umbraco是丹麦Umbraco公司的一套C#编写的开源的内容管理系统（CMS）。 Umbraco 14.0.0版本至16.5.1之前版本和17.2.2之前版本存在安全漏洞，该漏洞源于后台API端点授权执行不足，可能导致未经授权设置内容节点域。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
umbraco Umbraco-CMS >= 14.0.0, < 16.5.1 -

II. Public POCs for CVE-2026-31832

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III. Intelligence Information for CVE-2026-31832

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Same Patch Batch · umbraco · 2026-03-10 · 3 CVEs total

CVE-2026-31834 7.2 HIGH Umbraco Affected by Vertical Privilege Escalation via Missing Authorization Checks
CVE-2026-31833 6.7 MEDIUM Umbraco has Stored XSS in UFM Rendering Pipeline via Permissive DOMPurify Attribute Filter

IV. Related Vulnerabilities

Same product: Umbraco-CMS
Same vendor: umbraco
Same weakness: CWE-639

V. Comments for CVE-2026-31832

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