Description

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.

INFO

Published Date :

2026-03-10T21:51:51.407Z

Last Modified :

2026-03-11T15:58:47.606Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-31833 vulnerability.

Vendors Products
Umbraco
  • Cms
  • Umbraco Cms
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-31833.

URL Resource
https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-vrqc-59mw-qqg7 cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
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