EUVD-2026-193765

fkie_cve-2023-49278

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.

GHSA-7x74-h8cw-qhxq — Brute force exploit can be used to collect valid usernames

Affected: NuGet: Umbraco.CMS

#### Impact A brute force exploit that can be used to collect valid usernames is possible.

#### Explanation of the vulnerability It's a brute force exploit that can be used to collect valid usernames by using the “forgot password” function when trying to log into the Backoffice. If the username/email is known, it is easier to find the corresponding password. If an email address that was already used and registered by a user, is provided as an input, the server internal processing time takes longer. If the email address does not exist in the database of the registered users, the server would respond immediately.

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EUVD-2026-193765

fkie_cve-2023-49278

GHSA-7x74-h8cw-qhxq — Brute force exploit can be used to collect valid usernames

gsd-2023-49278