CVE-2026-45159 (GCVE-0-2026-45159)
Vulnerability from cvelistv5
Published
2026-06-01 16:39
Modified
2026-06-01 19:30
Severity ?
3.5 (Low) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Summary
Nextcloud is an open source content collaboration platform. From versions 1.15.0 to before 1.15.4, 1.16.0 to before 1.16.3, 1.17.0 to before 1.17.1, and 1.18.0 to before 1.18.1, a malicious user with access to an end-to-end encrypted files drop link was able to also drop files into other end-to-end encrypted folders of the share owner. Reading and modifying of other files was not possible. This issue has been patched in versions 1.15.4, 1.16.3, 1.17.1, 1.18.1, and 2.0.0-rc.7.
References
Impacted products
Vendor Product Version
nextcloud security-advisories Version: >= 1.15.0, < 1.15.4
Version: >= 1.16.0, < 1.16.3
Version: >= 1.17.0, < 1.17.1
Version: >= 1.18.0, < 1.18.1
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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45159",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-01T19:30:14.088508Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-01T19:30:25.192Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "security-advisories",
          "vendor": "nextcloud",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.15.0, \u003c 1.15.4"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.16.0, \u003c 1.16.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.17.0, \u003c 1.17.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.18.0, \u003c 1.18.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Nextcloud is an open source content collaboration platform. From versions 1.15.0 to before 1.15.4, 1.16.0 to before 1.16.3, 1.17.0 to before 1.17.1, and 1.18.0 to before 1.18.1, a malicious user with access to an end-to-end encrypted files drop link was able to also drop files into other end-to-end encrypted folders of the share owner. Reading and modifying of other files was not possible. This issue has been patched in versions 1.15.4, 1.16.3, 1.17.1, 1.18.1, and 2.0.0-rc.7."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.5,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-639",
              "description": "CWE-639: Authorization Bypass Through User-Controlled Key",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-01T16:39:38.836Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-p3qw-7gwx-wg24",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-p3qw-7gwx-wg24"
        },
        {
          "name": "https://github.com/nextcloud/end_to_end_encryption/pull/1395",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nextcloud/end_to_end_encryption/pull/1395"
        },
        {
          "name": "https://hackerone.com/reports/3304830",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://hackerone.com/reports/3304830"
        }
      ],
      "source": {
        "advisory": "GHSA-p3qw-7gwx-wg24",
        "discovery": "UNKNOWN"
      },
      "title": "Nextcloud: Files drop share links for end-to-end encrypted folders allowed to drop files into other folders of the share owner"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-45159",
    "datePublished": "2026-06-01T16:39:38.836Z",
    "dateReserved": "2026-05-08T20:44:38.965Z",
    "dateUpdated": "2026-06-01T19:30:25.192Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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