CVE-2026-42091
MEDIUMgoshs has Cross-Origin Arbitrary File Write via Missing CSRF on PUT and Wildcard CORS
Title source: cnaDescription
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 (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/patrickhener/goshs/security/advisories/GHSA-rhf7-wvw3-vjvm
X_Refsource_Misc x_refsource_misc
https://github.com/patrickhener/goshs/commit/0e715b94e10c3d1aa552276000f15f104dee2f32
X_Refsource_Misc x_refsource_misc
https://github.com/patrickhener/goshs/releases/tag/v2.0.2
Scores
CVSS v3
6.5
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Details
CWE
CWE-352
Status
published
Products (1)
patrickhener/goshs
< 2.0.2
Published
May 04, 2026
Tracked Since
May 04, 2026