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.
References
| Link | Resource |
|---|---|
| https://github.com/patrickhener/goshs/commit/0e715b94e10c3d1aa552276000f15f104dee2f32 | Patch |
| https://github.com/patrickhener/goshs/releases/tag/v2.0.2 | Product Release Notes |
| https://github.com/patrickhener/goshs/security/advisories/GHSA-rhf7-wvw3-vjvm | Exploit Vendor Advisory |
| https://github.com/patrickhener/goshs/security/advisories/GHSA-rhf7-wvw3-vjvm | Exploit Vendor Advisory |
Configurations
History
12 May 2026, 18:34
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:* | |
| References | () https://github.com/patrickhener/goshs/commit/0e715b94e10c3d1aa552276000f15f104dee2f32 - Patch | |
| References | () https://github.com/patrickhener/goshs/releases/tag/v2.0.2 - Product, Release Notes | |
| References | () https://github.com/patrickhener/goshs/security/advisories/GHSA-rhf7-wvw3-vjvm - Exploit, Vendor Advisory | |
| First Time |
Goshs
Goshs goshs |
05 May 2026, 16:16
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/patrickhener/goshs/security/advisories/GHSA-rhf7-wvw3-vjvm - |
04 May 2026, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-04 18:16
Updated : 2026-05-12 18:34
NVD link : CVE-2026-42091
Mitre link : CVE-2026-42091
CVE.ORG link : CVE-2026-42091
JSON object : View
Products Affected
goshs
- goshs
CWE
CWE-352
Cross-Site Request Forgery (CSRF)