goshs is a feature-rich single-binary file server for red teamers and developers. From 2.1.3 until 2.1.4, the sftpserver/sftpserver.go password handler used Username != "" && Password != "", so running goshs with -b 'admin:' -sftp and no -fkf left both SFTP authentication handlers unset and allowed unauthenticated file access. This issue is fixed in version 2.1.4.
https://github.com/goshs-labs/goshs/security/advisories/GHSA-rjrw-mjq6-hpmm
https://github.com/goshs-labs/goshs/releases/tag/v2.1.4
https://github.com/goshs-labs/goshs/commit/32f4a0e1790a709f722d0f3b2341f139d003180a