Cloudanix VulnDB

CVE-2026-31833

Medium · 6.7

CVSS

6.7

EPSS

0.5%

Published

Mar 10, 2026

CISA due date

—

The record

Umbraco is an ASP.NET CMS. From 16.2.0 to before 16.5.1 and 17.2.2, An authenticated backoffice user with access to Settings can inject malicious HTML into property type descriptions. Due to an overly permissive attributeNameCheck configuration (/.+/) in the UFM DOMPurify instance, event handler attributes such as onclick and onload, when used within Umbraco web components (umb-*, uui-*, ufm-*) were not filtered. This vulnerability is fixed in 16.5.1 and 17.2.2.

Affected packages

Ecosystem Package Introduced Fixed

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