CVE-2023-49278 Umbraco CMS brute force exploit can be used to collect valid usernames
Attackers can brute force valid usernames in Umbraco CMS, exposing user account information.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-49278?
CVE-2023-49278 is a medium-severity vulnerability in Umbraco Umbraco Cms, published on 12 Dec 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Umbraco is an ASP.NET content management system (CMS). Starting in version 8.0.0 and prior to versions 8.18.10, 10.8.1, and 12.3.4, a brute force exploit can be used to collect valid usernames. Versions 8.18.10, 10.8.1, and 12.3.4 contain a patch for this issue.
Which versions are affected by CVE-2023-49278?
6 open source packages ship an affected version, including Umbraco.CMS. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
Umbraco.CMS NuGet | From 11.0.0 | 12.3.4 |
Umbraco.CMS NuGet | From 11.0.0 | 12.3.4 |
Umbraco.CMS NuGet | From 8.0.0 | 8.18.10 |
Umbraco.CMS NuGet | From 8.0.0 | 8.18.10 |
Umbraco.CMS NuGet | From 9.0.0 | 10.8.1 |
Umbraco.CMS NuGet | From 9.0.0 | 10.8.1 |
Products include Umbraco Umbraco Cms.
How do I fix CVE-2023-49278?
Upgrade Umbraco.CMS to a fixed version for your release line: 12.3.4, 8.18.10 or 10.8.1.
Is CVE-2023-49278 being exploited?
There is no known exploitation of CVE-2023-49278 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-7x74-h8cw-qhxq.