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

Quick assessment

Affected
patrickhener goshs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 6.5 · Medium EPSS 0.23% · P12

Affected Version Matrix 1

VendorProduct Version RangeStatus
patrickhener goshs < 2.0.2 affected
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I. Basic Information for CVE-2026-42091

Vulnerability Information
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Vulnerability Title
goshs has Cross-Origin Arbitrary File Write via Missing CSRF on PUT and Wildcard CORS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
goshs 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
patrickhener goshs < 2.0.2 -

II. Public POCs for CVE-2026-42091

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III. Intelligence Information for CVE-2026-42091

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Patches & Fixes for CVE-2026-42091 (2)

Vendor Advisories for CVE-2026-42091 (1)

IV. Related Vulnerabilities

Same product: goshs
Same vendor: patrickhener
Same weakness: CWE-352

V. Comments for CVE-2026-42091

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