FKIE_CVE-2026-32255

Vulnerability from fkie_nvd - Published: 2026-03-19 00:16 - Updated: 2026-03-19 15:45
Severity ?
8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Summary
Kan is an open-source project management tool. In versions 0.5.4 and below, the /api/download/attatchment endpoint has no authentication and no URL validation. The Attachment Download endpoint accepts a user-supplied URL query parameter and passes it directly to fetch() server-side, and returns the full response body. An unauthenticated attacker can use this to make HTTP requests from the server to internal services, cloud metadata endpoints, or private network resources. This issue has been fixed in version 0.5.5. To workaround this issue, block or restrict access to /api/download/attatchment at the reverse proxy level (nginx, Cloudflare, etc.).
References
security-advisories@github.comhttps://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7Patch
security-advisories@github.comhttps://github.com/kanbn/kan/releases/tag/v0.5.5Product, Release Notes
security-advisories@github.comhttps://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqgMitigation, Patch, Vendor Advisory
Impacted products
Vendor Product Version
kan kan *
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{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:kan:kan:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2E0B59BF-8AB8-4D3D-AFE8-96A1D314712D",
              "versionEndExcluding": "0.5.5",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Kan is an open-source project management tool. In versions 0.5.4 and below, the /api/download/attatchment endpoint has no authentication and no URL validation. The Attachment Download endpoint accepts a user-supplied URL query parameter and passes it directly to fetch() server-side, and returns the full response body. An unauthenticated attacker can use this to make HTTP requests from the server to internal services, cloud metadata endpoints, or private network resources. This issue has been fixed in version 0.5.5. To workaround this issue, block or restrict access to /api/download/attatchment at the reverse proxy level (nginx, Cloudflare, etc.)."
    },
    {
      "lang": "es",
      "value": "Kan es una herramienta de gesti\u00f3n de proyectos de c\u00f3digo abierto. En las versiones 0.5.4 e inferiores, el endpoint /api/download/attatchment no tiene autenticaci\u00f3n ni validaci\u00f3n de URL. El endpoint de descarga de adjuntos acepta un par\u00e1metro de consulta de URL proporcionado por el usuario y lo pasa directamente a fetch() en el lado del servidor, y devuelve el cuerpo completo de la respuesta. Un atacante no autenticado puede usar esto para realizar solicitudes HTTP desde el servidor a servicios internos, endpoints de metadatos en la nube o recursos de red privados. Este problema ha sido solucionado en la versi\u00f3n 0.5.5. Para solucionar este problema, bloquee o restrinja el acceso a /api/download/attatchment a nivel de proxy inverso (nginx, Cloudflare, etc.)."
    }
  ],
  "id": "CVE-2026-32255",
  "lastModified": "2026-03-19T15:45:37.580",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-03-19T00:16:18.003",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/kanbn/kan/releases/tag/v0.5.5"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Mitigation",
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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