CVE-2023-37267 Umbraco allows possible Admin-level access to backoffice without Auth under rare conditions
Attackers can gain unauthorized admin access to the Umbraco backoffice under rare conditions following a restart.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2023-37267?
CVE-2023-37267 is a high-severity authentication bypass vulnerability in Umbraco Umbraco Cms, published on 13 Jul 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-284
Which versions are affected by CVE-2023-37267?
12 open source packages ship an affected version, including Umbraco.Cms.Infrastructure and Umbraco.Cms.Web.BackOffice. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
Umbraco.Cms.Infrastructure NuGet | From 11.0.0 | 11.4.2 |
Umbraco.Cms.Infrastructure NuGet | From 11.0.0 | 11.4.2 |
Umbraco.Cms.Infrastructure NuGet | From 12.0.0 | 12.0.1 |
Umbraco.Cms.Infrastructure NuGet | From 12.0.0 | 12.0.1 |
Umbraco.Cms.Infrastructure NuGet | From 9.0.0 | 10.6.1 |
Umbraco.Cms.Infrastructure NuGet | From 9.0.0 | 10.6.1 |
6 more packages
Umbraco.Cms.Web.BackOffice NuGet | From 11.0.0 | 11.4.2 |
Umbraco.Cms.Web.BackOffice NuGet | From 11.0.0 | 11.4.2 |
Umbraco.Cms.Web.BackOffice NuGet | From 12.0.0 | 12.0.1 |
Umbraco.Cms.Web.BackOffice NuGet | From 12.0.0 | 12.0.1 |
Umbraco.Cms.Web.BackOffice NuGet | From 9.0.0 | 10.6.1 |
Umbraco.Cms.Web.BackOffice NuGet | From 9.0.0 | 10.6.1 |
Products include Umbraco Umbraco Cms.
How do I fix CVE-2023-37267?
Upgrade Umbraco.Cms.Infrastructure to a fixed version for your release line: 11.4.2, 12.0.1 or 10.6.1.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2023-37267 being exploited?
There is no known exploitation of CVE-2023-37267 in the wild and no public exploit code.
Other vulnerabilities in Umbraco Umbraco Cms
- CVE-2025-67288 Umbraco CMS has an arbitrary file upload vulnerability
- CVE-2014-10074 File upload in n/a
- CVE-2012-1301 Server-side request forgery in n/a
- CVE-2012-10054 Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE
- CVE-2025-32017 Umbraco has a Management API Vulnerability to Path Traversal With Authenticated Users
Sources
Also known as GHSA-h8wc-r4jh-mg7m.