← Back to CVE Explorer

CVE-2026-40884

Full vulnerability record from the local CVENow database.

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.

Severity
CRITICAL
CVSS score
9.8 (v3.1)
Vulnerability status
Analyzed
Source identifier
Published
2026-04-21 20:17:02.107000
Last modified
2026-10-26 21:10:00.170000
View original CVE JSON
{
  "id": "CVE-2026-40884",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-21T20:17:02.107",
  "lastModified": "2026-10-26T21:10:00.170",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "goshs es un SimpleHTTPServer escrito en Go. Anteriormente a la versión 2.0.0-beta.6, goshs contiene una omisión de autenticación SFTP cuando se utiliza la sintaxis de autenticación básica de nombre de usuario vacío documentada. Si el servidor se inicia con -b ’:pass’ junto con -sftp, goshs acepta esa configuración pero no instala ningún gestor de contraseñas SFTP. Como resultado, un atacante de red no autenticado puede conectarse al servicio SFTP y acceder a archivos sin una contraseña. Esta vulnerabilidad se corrige en la versión 2.0.0-beta.6."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "patrickhener",
          "product": "goshs",
          "versions": [
            {
              "version": "< 2.0.0-beta.6",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-22T13:43:56.178845Z",
          "id": "CVE-2026-40884",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-306"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:*",
              "versionEndExcluding": "2.0.0",
              "matchCriteriaId": "471EA45E-3052-469D-B301-4D92FB187228"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:goshs:goshs:2.0.0:beta1:*:*:*:go:*:*",
              "matchCriteriaId": "047ECFC3-056F-4FAC-9B64-5F7C120CFFE1"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:goshs:goshs:2.0.0:beta2:*:*:*:go:*:*",
              "matchCriteriaId": "6EA86AD2-EE6D-4427-9434-A9A49A4D38F9"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:goshs:goshs:2.0.0:beta3:*:*:*:go:*:*",
              "matchCriteriaId": "F44CF6A3-C1BC-4636-A1D5-1ED69A340FE3"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:goshs:goshs:2.0.0:beta4:*:*:*:go:*:*",
              "matchCriteriaId": "486D1F77-023B-4EB9-8B49-17EF6546F2DF"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:goshs:goshs:2.0.0:beta5:*:*:*:go:*:*",
              "matchCriteriaId": "5834E73F-2EF9-42BD-BE8B-DE087A19A132"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/patrickhener/goshs/security/advisories/GHSA-c29w-qq4m-2gcv",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/patrickhener/goshs/security/advisories/GHSA-c29w-qq4m-2gcv",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    }
  ]
}