FKIE_CVE-2026-45156

Vulnerability from fkie_nvd - Published: 2026-06-01 17:17 - Updated: 2026-07-22 07:10
Severity
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Summary
Nextcloud is an open source content collaboration platform. From versions 0.3.0 to before 3.1.0, 5.0.0 to before 5.1.0, and 6.0.0 to before 6.4.0, a missing signature verification in User OIDC allowed a malicious ID4me authority to identify as any user. This issue has been patched in versions 3.1.0, 4.1.0, 5.1.0, 6.4.0 and 8.3.0.
References
security-advisories@github.comhttps://github.com/nextcloud/security-advisories/security/advisories/GHSA-qqgv-fqwp-mjpp
security-advisories@github.comhttps://github.com/nextcloud/user_oidc/pull/1285
security-advisories@github.comhttps://hackerone.com/reports/3489490
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "security-advisories",
          "vendor": "nextcloud",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.3.0, \u003c 3.1.0"
            },
            {
              "status": "affected",
              "version": "\u003e= 5.0.0, \u003c 5.1.0"
            },
            {
              "status": "affected",
              "version": "\u003e= 6.0.0, \u003c 6.4.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Nextcloud is an open source content collaboration platform. From versions 0.3.0 to before 3.1.0, 5.0.0 to before 5.1.0, and 6.0.0 to before 6.4.0, a missing signature verification in User OIDC allowed a malicious ID4me authority to identify as any user. This issue has been patched in versions 3.1.0, 4.1.0, 5.1.0, 6.4.0 and 8.3.0."
    },
    {
      "lang": "es",
      "value": "Nextcloud es una plataforma de colaboraci\u00f3n de contenido de c\u00f3digo abierto. Desde las versiones 0.3.0 hasta antes de la 3.1.0, 5.0.0 hasta antes de la 5.1.0, y 6.0.0 hasta antes de la 6.4.0, una verificaci\u00f3n de firma faltante en User OIDC permiti\u00f3 a una autoridad ID4me maliciosa identificarse como cualquier usuario. Este problema ha sido parcheado en las versiones 3.1.0, 4.1.0, 5.1.0, 6.4.0 y 8.3.0."
    }
  ],
  "id": "CVE-2026-45156",
  "lastModified": "2026-07-22T07:10:00.107",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-45156",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-02T00:00:00+00:00",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-01T17:17:09.283",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qqgv-fqwp-mjpp"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nextcloud/user_oidc/pull/1285"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://hackerone.com/reports/3489490"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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