Umbraco is a free and open source .NET content management system. In versions on the 13.x branch prior to 13.5.2 and versions on the 10.x branch prior to 10.8.7, during an explicit sign-out, the server session is not fully terminated. Versions 13.5.2 and 10.8.7 contain a patch for the issue.
Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Umbraco_cms | Umbraco | 10.0 (including) | 10.8.7 (excluding) |
| Umbraco_cms | Umbraco | 13.0 (including) | 13.5.2 (excluding) |
Such a scenario is commonly observed when: