CVE-2026-40884
goshs: Empty-username SFTP password authentication bypass in goshs
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.
INFO
Published Date :
April 21, 2026, 8:17 p.m.
Last Modified :
April 27, 2026, 2:55 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update goshs to 2.0.0-beta.6 or newer.
- Disable SFTP if not required.
- Review SFTP configuration settings.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-40884.
| URL | Resource |
|---|---|
| https://github.com/patrickhener/goshs/security/advisories/GHSA-c29w-qq4m-2gcv | Exploit Vendor Advisory |
| https://github.com/patrickhener/goshs/security/advisories/GHSA-c29w-qq4m-2gcv | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-40884 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-40884
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40884 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-40884 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 27, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:goshs:goshs:2.0.0:beta1:*:*:*:go:*:* *cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:* versions up to (excluding) 2.0.0 *cpe:2.3:a:goshs:goshs:2.0.0:beta2:*:*:*:go:*:* *cpe:2.3:a:goshs:goshs:2.0.0:beta3:*:*:*:go:*:* *cpe:2.3:a:goshs:goshs:2.0.0:beta4:*:*:*:go:*:* *cpe:2.3:a:goshs:goshs:2.0.0:beta5:*:*:*:go:*:* Added Reference Type CISA-ADP: https://github.com/patrickhener/goshs/security/advisories/GHSA-c29w-qq4m-2gcv Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/patrickhener/goshs/security/advisories/GHSA-c29w-qq4m-2gcv Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 22, 2026
Action Type Old Value New Value Added Reference https://github.com/patrickhener/goshs/security/advisories/GHSA-c29w-qq4m-2gcv -
New CVE Received by [email protected]
Apr. 21, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-306 Added Reference https://github.com/patrickhener/goshs/security/advisories/GHSA-c29w-qq4m-2gcv