FKIE_CVE-2026-40304

Vulnerability from fkie_nvd - Published: 2026-04-17 22:16 - Updated: 2026-10-26 22:10
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, the unaccess handler (controller/unaccess.go) contains a logical error in its ownership guard: when a frontend record has environment_id = NULL (the marker for admin-created global frontends), the condition short-circuits to false and allows the deletion to proceed without any ownership verification. A non-admin user who knows a global frontend token can call DELETE /api/v2/unaccess with any of their own environment IDs and permanently delete the global frontend, taking down all public shares routed through it. Version 2.0.1 patches the issue.
References
security-advisories@github.comhttps://github.com/openziti/zrok/releases/tag/v2.0.1Release Notes
security-advisories@github.comhttps://github.com/openziti/zrok/security/advisories/GHSA-3jpj-v3xr-5h6gVendor Advisory
Impacted products
Vendor Product Version
netfoundry zrok *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "zrok",
          "vendor": "openziti",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.0.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:netfoundry:zrok:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "70C6F018-6D34-4A75-A49D-A795B0A5B056",
              "versionEndExcluding": "2.0.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, the unaccess handler (controller/unaccess.go) contains a logical error in its ownership guard: when a frontend record has environment_id = NULL (the marker for admin-created global frontends), the condition short-circuits to false and allows the deletion to proceed without any ownership verification. A non-admin user who knows a global frontend token can call DELETE /api/v2/unaccess with any of their own environment IDs and permanently delete the global frontend, taking down all public shares routed through it. Version 2.0.1 patches the issue."
    },
    {
      "lang": "es",
      "value": "zrok es un software para compartir servicios web, archivos y recursos de red. Antes de la versi\u00f3n 2.0.1, el gestor de desacceso (controller/unaccess.go) contiene un error l\u00f3gico en su protecci\u00f3n de propiedad: cuando un registro de frontend tiene environment_id = NULL (el marcador para frontends globales creados por administradores), la condici\u00f3n se cortocircuita a falso y permite que la eliminaci\u00f3n proceda sin ninguna verificaci\u00f3n de propiedad. Un usuario no administrador que conoce un token de frontend global puede llamar a DELETE /api/v2/unaccess con cualquiera de sus propios IDs de entorno y eliminar permanentemente el frontend global, derribando todas las comparticiones p\u00fablicas enrutadas a trav\u00e9s de \u00e9l. La versi\u00f3n 2.0.1 parchea el problema."
    }
  ],
  "id": "CVE-2026-40304",
  "lastModified": "2026-10-26T22:10:00.163",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-40304",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-20T14:51:35.879686Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-17T22:16:32.230",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/openziti/zrok/releases/tag/v2.0.1"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/openziti/zrok/security/advisories/GHSA-3jpj-v3xr-5h6g"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        },
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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