What is CVE-2026-40884?

CVE-2026-40884 is a critical-severity vulnerability in Goshs, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-04-21.

How severe is CVE-2026-40884?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Goshs

CVE-2026-40884

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, gosh…

Vulnerability class: Broken Authentication

EPSS: 0.005 (38.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Goshs — versions 2.0.0
Patrickhener Goshs — versions < 2.0.0-beta.6

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-40884?: CVE-2026-40884 is a critical-severity vulnerability in Goshs, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-04-21.
How severe is CVE-2026-40884?: Critical severity. CVSS v3 base score is 9.8 out of 10.