https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-07T18:21:23.163964+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/euvd-2026-275536 EUVD-2026-275536 2026-10-07T18:21:23.217171+00:00 EUVD-2026-275536 https://cve.radiocsirt.org/vuln/fkie_cve-2026-31833 fkie_cve-2026-31833 2026-10-07T18:21:23.217209+00:00

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.

 https://cve.radiocsirt.org/vuln/ghsa-vrqc-59mw-qqg7 GHSA-vrqc-59mw-qqg7 — Umbraco has Stored XSS in UFM Rendering Pipeline via Permissive DOMPurify Attribute Filtering 2026-10-07T18:21:23.217243+00:00

Affected: NuGet: Umbraco.Cms

### Description 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.

### Impact As property type descriptions support Markdown/HTML via the UFM rendering pipeline, injected event handlers are rendered in the backoffice interface, resulting in a stored XSS affecting other backoffice users.

### Patches The issue is patched in 16.5.1 and 17.2.2.

### Workarounds There is no workaround other than upgrading.

### References https://docs.umbraco.com/umbraco-cms/reference/umbraco-flavored-markdown