goshs has a file-based ACL authorization bypass in goshs state-changing routes

Summary

goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.4, goshs enforces the documented per-folder .goshs ACL/basic-auth mechanism for directory listings and file reads, but it does not enforce the same authorization checks for state-changing routes. An unauthenticated attacker can upload files with PUT, upload files with multipart POST /upload, create directories with ?mkdir, and delete files with ?delete inside a .goshs-protected directory. By deleting the .goshs file itself, the attacker can remove the folder's auth policy and then access previously protected content without credentials. This results in a critical authorization bypass affecting confidentiality, integrity, and availability. This vulnerability is fixed in 2.0.0-beta.4.

Timeline

1. Apr 10, 2026, 7:44 PM UTCCVE published
2. Apr 13, 2026, 8:52 PM UTCCISA SSVC assessment

   Exploitation: poc · Automatable: yes · Technical impact: total

3. Apr 13, 2026, 8:53 PM UTCRecord last updated

Affected versions

• patrickhener goshs

  fixed in 2.0.0-beta.4

• github.com/patrickhener/goshsGo

  All versions

• github.com/patrickhener/goshsGo

  through 1.1.4

References 3