CVE-2026-42091
Severity CVSS v4.0:
Pending analysis
Type:
CWE-352
Cross-Site Request Forgery (CSRF)
Publication date:
04/05/2026
Last modified:
05/05/2026
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.
Impact
Base Score 3.x
6.50
Severity 3.x
MEDIUM