CVE-2026-40884 | goshs: Empty-username SFTP password authentication bypass in goshs

Exp

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.

Published: 2026-04-21 Last update: 2026-04-27 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-40884 is rated High Exploit Risk (60.3/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.06%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2026-40884

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-40884

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-22 — 0.06% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-40884

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2026-40884

GitHub Security Advisory for CVE-2026-40884

GHSA-c29w-qq4m-2gcv · Severity: critical · Ecosystem: go — goshs has an empty-username SFTP password authentication bypass

Affected software / configurations for CVE-2026-40884

Vendor Product Version Raw CPE
goshs goshs < 2.0.0 cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:*
goshs goshs 2.0.0 cpe:2.3:a:goshs:goshs:2.0.0:beta1:*:*:*:go:*:*
goshs goshs 2.0.0 cpe:2.3:a:goshs:goshs:2.0.0:beta2:*:*:*:go:*:*
goshs goshs 2.0.0 cpe:2.3:a:goshs:goshs:2.0.0:beta3:*:*:*:go:*:*
goshs goshs 2.0.0 cpe:2.3:a:goshs:goshs:2.0.0:beta4:*:*:*:go:*:*
goshs goshs 2.0.0 cpe:2.3:a:goshs:goshs:2.0.0:beta5:*:*:*:go:*:*

References for CVE-2026-40884

cvelogic Threat Intelligence