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CVE-2026-45284

Estado: AnalizadaAlta (8.8)—

Nextcloud is an open source content collaboration platform. From version 1.3.6 to before version 8.4.0, an improper check allowed users that where provided by LDAP to still authenticate towards user OIDC after they where deleted. This issue has been patched in version 8.4.0.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:N/AC:L/PR:L: acceso remoto sin privilegios previos sobre servicio de autenticación. T1078.001: reutilización de credenciales LDAP para acceso OIDC tras borrado de usuario. T1098.001: manipulación de cuentas mediante autenticación impropia.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementNetwork SegmentationMulti-factor AuthenticationDisable or Remove Feature or ProgramVulnerability ScanningUser Account Management

Tecnologías afectadas (1)

Nextcloud — User Oidc

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-45284",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-45284",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-02T15:21:53.007287Z"
        }
      }
    ],
    "cvssMetricV31": [
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          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "LOW",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "LOW"
        },
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        "exploitabilityScore": 1.2
      },
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          "attackVector": "NETWORK",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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  "published": "2026-06-01T19:16:50.670",
  "references": [
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      "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-79xf-ffj8-96fm",
      "tags": [
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      "url": "https://github.com/nextcloud/user_oidc/pull/1340",
      "tags": [
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        "Patch"
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    },
    {
      "url": "https://hackerone.com/reports/3554696",
      "tags": [
        "Permissions Required"
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      "source": "security-advisories@github.com"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        }
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    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
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  ],
  "descriptions": [
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    },
    {
      "lang": "es",
      "value": "Nextcloud es una plataforma de colaboración de contenido de código abierto. Desde la versión 1.3.6 hasta antes de la versión 8.4.0, una comprobación inadecuada permitía a los usuarios que eran provistos por LDAP autenticarse aún contra OIDC de usuario después de que fueran eliminados. Este problema ha sido parcheado en la versión 8.4.0."
    }
  ],
  "lastModified": "2026-07-22T08:10:00.117",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "versionEndExcluding": "8.4.0",
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          ],
          "operator": "OR"
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}