Detections
Analytics

SCA: security update for Umbraco.Cms (GHSA-vrqc-59mw-qqg7)

medium Tenable Cloud Security Plugin ID 438642

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2026-31833)

Solution

Update the Umbraco.Cms library and its related packages to version 16.5.1 or later.

See Also

https://github.com/advisories/GHSA-vrqc-59mw-qqg7

Plugin Details

Severity: Medium

ID: 438642

Version: Revision 1.7

Type: Local

Family: SCA Checks

Published: 3/11/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.5

Percentile: 57.44

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: High

Base Score: 8

Temporal Score: 5.9

Vector: CVSS2#AV:N/AC:L/Au:M/C:C/I:C/A:P

CVSS Score Source: CVE-2026-31833

CVSS v3

Risk Factor: Medium

Base Score: 6.7

Temporal Score: 5.8

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 3/11/2026

Vulnerability Publication Date: 3/10/2026

Reference Information

CVE: CVE-2026-31833

cwe: CWE-79