EUVD-2026-198808

fkie_cve-2023-37267

Umbraco is a ASP.NET CMS. Under rare conditions a restart of Umbraco can allow unauthorized users access to admin-level permissions. This vulnerability was patched in versions 10.6.1, 11.4.2 and 12.0.1.

GHSA-h8wc-r4jh-mg7m — Umbraco allows possible Admin-level access to backoffice without Auth under rare conditions

Affected: NuGet: Umbraco.Cms.Infrastructure, NuGet: Umbraco.Cms.Web.BackOffice

Under rare conditions, a restart of Umbraco can allow unauthorized users to gain admin-level permissions.

### Impact An unauthorized user gaining admin-level access and permissions to the backoffice.

### Patches 10.6.1, 11.4.2, 12.0.1

### Workarounds * Enabling the [Unattended Install](https://docs.umbraco.com/umbraco-cms/reference/configuration/unattendedsettings) feature will mean the vulnerability is not exploitable. * Enabling IP restrictions to `*/install/*` and `*/umbraco/*` will limit the exposure to allowed IP addresses.

Most recent entries from all

EUVD-2026-198808

fkie_cve-2023-37267

GHSA-h8wc-r4jh-mg7m — Umbraco allows possible Admin-level access to backoffice without Auth under rare conditions

gsd-2023-37267