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CVE-2026-40884— goshs: Empty-username SFTP password authentication bypass in goshs

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 2.0.0-beta.6之前版本存在访问控制错误漏洞，该漏洞源于使用文档记录的空用户名基本身份验证语法时，未安装SFTP密码处理程序，可能导致未经身份验证的网络攻击者无需密码访问SFTP服务。

CVSS 9.8 · Critical EPSS 0.65% · P49
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I. Basic Information for CVE-2026-40884

Vulnerability Information
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Vulnerability Title
goshs: Empty-username SFTP password authentication bypass in goshs
Source: CVE Program / CVE List V5
Vulnerability Description
goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.6, goshs contains an SFTP authentication bypass when the documented empty-username basic-auth syntax is used. If the server is started with -b ':pass' together with -sftp, goshs accepts that configuration but does not install any SFTP password handler. As a result, an unauthenticated network attacker can connect to the SFTP service and access files without a password. This vulnerability is fixed in 2.0.0-beta.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
goshs 访问控制错误漏洞
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 2.0.0-beta.6之前版本存在访问控制错误漏洞，该漏洞源于使用文档记录的空用户名基本身份验证语法时，未安装SFTP密码处理程序，可能导致未经身份验证的网络攻击者无需密码访问SFTP服务。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
patrickhener goshs < 2.0.0-beta.6 -

II. Public POCs for CVE-2026-40884

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III. Intelligence Information for CVE-2026-40884

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Vendor Advisories for CVE-2026-40884 (1)

Same Patch Batch · patrickhener · 2026-04-21 · 5 CVEs total

CVE-2026-40903 9.1 CRITICAL Goshs - ArtiPACKED Vulnerability – GitHub Actions Credential Persistence
CVE-2026-40876 SFTP root escape via prefix-based path validation in goshs
CVE-2026-40883 goshs: CSRF in state-changing GET routes enables authenticated file deletion and directory
CVE-2026-40885 goshs: Public collaborator feed leaks .goshs ACL credentials and enables unauthorized acce

IV. Related Vulnerabilities

Same product: goshs
Same vendor: patrickhener
Same weakness: CWE-306

V. Comments for CVE-2026-40884

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