Umbraco is a free and open source .NET content management system. Authenticated users to the Umbraco backoffice are able to craft management API request that exploit a path traversal vulnerability to upload files into a incorrect location. The issue affects Umbraco 14+ and is patched in 14.3.4 and 15.3.1.
https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-q62r-8ppj-xvf4
https://github.com/umbraco/Umbraco-CMS/commit/d3c1443b14b1076faf13d1bcecc42860fdf5fad8
https://github.com/umbraco/Umbraco-CMS/commit/06a2a500b358ce15b1e228391eb60bd517c6e833