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.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/patrickhener/goshs/commit/0e715b94e10c3d1aa552276000f15f104dee2f32 Patch
- 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
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.5 · goshsNVD modified 2026-10-26 19:10
Affected (CPE criteria) 1
cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:*
References 4
- 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