Umbraco is an ASP.NET content management system (CMS). Starting in version 14.0.0 and prior to versions 15.4.2 and 16.0.0, it's possible to upload a file that doesn't adhere with the configured allowable file extensions via a manipulated API request. The issue is patched in versions 15.4.2 and 16.0.0. No known workarounds are available.
| Software | From | Fixed in |
|---|---|---|
Umbraco.CMS
|
14.0.0 | 15.4.2 |
| umbraco / umbraco_cms | 14.0.0 | 15.4.2 |