CVE Feed

    Dashboard / CVE / CVE-2026-31833

    CVE-2026-31833

    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.

    Published:Mar 10, 2026
    Last Modified:Apr 16, 2026
    EPS:Mar 10, 2026
    EPSS Score:0.00063
    CVSS Score:6.7

    Affected Products

    Vendor
    Umbraco
    Product
    Cms
    Vendor
    Umbraco
    Product
    Umbraco Cms

    Exploits

    No exploit reference

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High