# CVE-2026-40884: goshs has an empty-username SFTP password authentication bypass

Source: https://junglewise.ai/threats/cve-2026-40884-goshs-has-an-empty-username-sftp-password-authentication-bypass  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-21. Updated: 2026-05-11  
License: CC BY 4.0 with a link back

CVE-2026-40884 · Severity: critical · CVSS 9.8 · Published 2026-04-21

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.

Technologies: [github.com/patrickhener/goshs (Go)](https://junglewise.ai/threats/technologies/github-com-patrickhener-goshs), [github.com/patrickhener/goshs/v2 (Go)](https://junglewise.ai/threats/technologies/github-com-patrickhener-goshs-v2), [Goshs](https://junglewise.ai/threats/technologies/goshs). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Goshs](https://junglewise.ai/threats/vendors/goshs).

## Quick answers

**Is CVE-2026-40884 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-40884 being exploited in the wild.

**How severe is CVE-2026-40884?** Critical severity, with a CVSS score of 9.8, published 21 April 2026.

**Which products and versions are affected?** github.com/patrickhener/goshs (Go) <= 1.1.4, SEMVER:introduced=0, SEMVER:introduced=0,last_affected=1.1.4; github.com/patrickhener/goshs/v2 (Go) < 2.0.0, SEMVER:introduced=0,fixed=2.0.0.

**Is there a fix for CVE-2026-40884?** Yes. github.com/patrickhener/goshs/v2 (Go): upgrade to 2.0.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-40884?** Check whether you run github.com/patrickhener/goshs (Go), github.com/patrickhener/goshs/v2 (Go) or Goshs at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/patrickhener/goshs/v2 (Go): upgrade to 2.0.0 or later

  ```sh
  go get github.com/patrickhener/goshs/v2@v2.0.0
  ```


## Affected products

- github.com/patrickhener/goshs (Go) <= 1.1.4, SEMVER:introduced=0, SEMVER:introduced=0,last_affected=1.1.4
- github.com/patrickhener/goshs/v2 (Go) < 2.0.0, SEMVER:introduced=0,fixed=2.0.0
- Goshs

## Identifiers

- CVE-2026-40884
- GHSA-c29w-qq4m-2gcv
- GO-2026-5303

## References

- [https://api.github.com/users/R1ZZG0D](https://api.github.com/users/R1ZZG0D)
- [https://github.com/R1ZZG0D](https://github.com/R1ZZG0D)
- [https://api.github.com/users/R1ZZG0D/gists%7B/gist_id%7D](https://api.github.com/users/R1ZZG0D/gists%7B/gist_id%7D)
- [https://api.github.com/users/R1ZZG0D/repos](https://api.github.com/users/R1ZZG0D/repos)
- [https://avatars.githubusercontent.com/u/72493187?v=4](https://avatars.githubusercontent.com/u/72493187?v=4)
- [https://api.github.com/users/R1ZZG0D/events%7B/privacy%7D](https://api.github.com/users/R1ZZG0D/events%7B/privacy%7D)

## Related threats

- [goshs-labs goshs ACL bypass via trailing slash in sendFile handler](https://junglewise.ai/threats/cve-2026-66064-goshs-labs-goshs-acl-bypass-via-trailing-slash-in-sendfile)
- [goshs path traversal in multipart upload handler](https://junglewise.ai/threats/cve-2026-66063-goshs-path-traversal-in-multipart-upload-handler)
- [goshs WebDAV deletion bypass via MOVE and COPY methods](https://junglewise.ai/threats/cve-2026-64863-goshs-webdav-deletion-bypass-via-move-and-copy-methods)
- [goshs SFTP authentication bypass via empty password handler logic](https://junglewise.ai/threats/cve-2026-62325-goshs-sftp-authentication-bypass-via-empty-password-handler-logic)
- [goshs-labs goshs authorization bypass in bulkDownload handler](https://junglewise.ai/threats/cve-2026-54719-goshs-labs-goshs-authorization-bypass-in-bulkdownload-handler)