GHSA-7x74-h8cw-qhxq
Brute force exploit can be used to collect valid usernames
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| NuGet | Umbraco.CMS | >= 8.0.0, < 8.18.10 | 8.18.10 |
| NuGet | Umbraco.CMS | >= 9.0.0, < 10.8.1 | 10.8.1 |
| NuGet | Umbraco.CMS | >= 11.0.0, < 12.3.4 | 12.3.4 |
Details
As written in the advisory (Markdown source, shown as plain text).
#### 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.
References
External links from the advisory. They lead to third-party sites.