CVE-2026-42091— goshs has Cross-Origin Arbitrary File Write via Missing CSRF on PUT and Wildcard CORS

goshs has Cross-Origin Arbitrary File Write via Missing CSRF on PUT and Wildcard CORS

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

跨站请求伪造(CSRF)

goshs 跨站请求伪造漏洞

goshs是Patrick Hener个人开发者的一个用Go编写的简单HTTP Server。 goshs 2.0.2之前版本存在跨站请求伪造漏洞，该漏洞源于PUT上传处理程序缺少CSRF令牌验证，结合OPTIONS预检处理程序的无条件跨域资源共享标头，可能导致任意网站通过受害者浏览器写入任意文件。

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