CVE-2026-40884CWE-306

goshs: Empty-username SFTP password authentication bypass in goshs

Critical · published April 21, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
50.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00645 · 50.3th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2026-04-21T19:39Z
EPSS history
Timeline
  • 21 APR 19:39Z
    goshs: Empty-username SFTP password authentication bypass in goshs
    cvelistv5