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CVE-2026-45157

Estado: AplazadaMedia (6.3)—

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, when a malicious user has access to a file share of a user, they could use this share token to also access the chunking upload directly and see temporary part files during on going uploads. It is recommended that the Nextcloud Server is upgraded to 32.0.9 or 33.0.3. It is recommended that the Nextcloud Enterprise Server is upgraded to 26.0.13.26, 27.1.11.25, 28.0.14.17, 29.0.16.16, 30.0.17.9, 31.0.14.5, 32.0.9 or 33.0.3

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Nextcloud — Nextcloud Enterprise ServerAINextcloud — Nextcloud ServerAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-45157",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-45157",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-01T18:49:11.015107Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 4.2,
        "exploitabilityScore": 2.1
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "nextcloud",
          "product": "security-advisories",
          "versions": [
            {
              "status": "affected",
              "version": ">= 32.0.0, < 32.0.9"
            },
            {
              "status": "affected",
              "version": ">= 33.0.0, < 33.0.3"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-06-01T17:17:09.420",
  "references": [
    {
      "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-45pj-p7x7-4mhc",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/nextcloud/server/pull/59780",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://hackerone.com/reports/3483708",
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, when a malicious user has access to a file share of a user, they could use this share token to also access the chunking upload directly and see temporary part files during on going uploads. It is recommended that the Nextcloud Server is upgraded to 32.0.9 or 33.0.3. It is recommended that the Nextcloud Enterprise Server is upgraded to 26.0.13.26, 27.1.11.25, 28.0.14.17, 29.0.16.16, 30.0.17.9, 31.0.14.5, 32.0.9 or 33.0.3"
    },
    {
      "lang": "es",
      "value": "Nextcloud es una plataforma de colaboración de contenido de código abierto. En Nextcloud Servidor, desde las versiones 32.0.0 hasta antes de la 32.0.9, y de la 33.0.0 hasta antes de la 33.0.3, cuando un usuario malicioso tiene acceso a un recurso compartido de archivos de un usuario, podría usar este token de recurso compartido para también acceder directamente a la carga por fragmentos y ver archivos de parte temporales durante las cargas en curso. Se recomienda que el Nextcloud Servidor se actualice a la 32.0.9 o a la 33.0.3. Se recomienda que el Nextcloud Enterprise Servidor se actualice a la 26.0.13.26, 27.1.11.25, 28.0.14.17, 29.0.16.16, 30.0.17.9, 31.0.14.5, 32.0.9 o a la 33.0.3."
    }
  ],
  "lastModified": "2026-07-22T07:10:00.107",
  "sourceIdentifier": "security-advisories@github.com"
}