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.
History

Wed, 11 Mar 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 11 Mar 2026 12:00:00 +0000

Type Values Removed Values Added
First Time appeared Umbraco
Umbraco cms
Vendors & Products Umbraco
Umbraco cms

Tue, 10 Mar 2026 22:00:00 +0000

Type Values Removed Values Added
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.
Title Umbraco has Stored XSS in UFM Rendering Pipeline via Permissive DOMPurify Attribute Filtering
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 6.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-03-10T21:51:51.407Z

Updated: 2026-03-11T15:58:47.606Z

Reserved: 2026-03-09T17:41:56.077Z

Link: CVE-2026-31833

cve-icon Vulnrichment

Updated: 2026-03-11T15:52:32.401Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-10T22:16:21.410

Modified: 2026-03-11T13:52:47.683

Link: CVE-2026-31833

cve-icon Redhat

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