Description
goshs is a SimpleHTTPServer written in Go. Prior to version 2.0.2, the PUT upload handler (httpserver/updown.go) lacks the CSRF token validation that was added to the POST upload handler during the CVE-2026-40883 fix. Combined with the unconditional Access-Control-Allow-Origin: * on the OPTIONS preflight handler (httpserver/server.go), any website can write arbitrary files to a goshs instance through the victim's browser — bypassing network isolation (e.g. localhost, internal network). This issue has been patched in version 2.0.2.
Problem types
CWE-352: Cross-Site Request Forgery (CSRF)
Product status
References
github.com/.../goshs/security/advisories/GHSA-rhf7-wvw3-vjvm
github.com/.../goshs/security/advisories/GHSA-rhf7-wvw3-vjvm
github.com/...ommit/0e715b94e10c3d1aa552276000f15f104dee2f32
github.com/patrickhener/goshs/releases/tag/v2.0.2