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Vulnerability record · CVE-2026-40884 · published 21 April 2026

CVE-2026-40884: Goshs missing authentication for critical function vulnerability

Goshs · Goshs

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.

9.8 CVSS 3.1 Critical EPSS 0.65% · top 51.1% CWE-306 · Missing authentication for critical function
9.8CVSS 3.1 base score
0.65%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/patrickhener/goshs/security/advisories/GHSA-c29w-qq4m-2gcv ExploitVendor Advisory
https://github.com/patrickhener/goshs/security/advisories/GHSA-c29w-qq4m-2gcv ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-35471Goshs path traversal vulnerabilitygoshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.3, tdeleteFile() missing return after path traversal check. This vulnerability is fixe…EPSS 0.69%9.8CVE-2026-35392Goshs path traversal vulnerabilitygoshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.3, PUT upload in httpserver/updown.go has no path sanitization. This vulnerability is …EPSS 0.69%9.8CVE-2026-35393Goshs path traversal vulnerabilitygoshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.3, the POST multipart upload directory not sanitized. This vulnerability is fixed in 2…EPSS 0.69%9.3CVE-2026-40189Goshs missing authorization vulnerabilitygoshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.4, goshs enforces the documented per-folder .goshs ACL/basic-auth mechanism for direct…EPSS 0.66%9.1CVE-2026-40903Goshs inclusion from untrusted sphere vulnerabilitygoshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.6, goshs has an ArtiPACKED vulnerability. ArtiPACKED can lead to leakage of the GITHUB…EPSS 0.43%8.7CVE-2026-40876Goshs path traversal vulnerabilitygoshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.6, goshs contains an SFTP root escape caused by prefix-based path validation. An authe…EPSS 0.59%8.1CVE-2026-34581Goshs authentication bypass via alternate path vulnerabilitygoshs is a SimpleHTTPServer written in Go. From version 1.1.0 to before version 2.0.0-beta.2, when using the Share Token it is possible to bypass the…EPSS 0.45%7.7CVE-2026-40885Goshs information exposure vulnerabilitygoshs is a SimpleHTTPServer written in Go. From 2.0.0-beta.4 to 2.0.0-beta.5, goshs leaks file-based ACL credentials through its public collaborator …EPSS 0.45%

Source: NIST National Vulnerability Database (record CVE-2026-40884), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.