Security advisory

{
  "id": "94f99f7abb7c6f3fd6edf21668790a88f2ef2cc2c477adc8cbf99af8a3dc608e",
  "url": "https://osv.dev/vulnerability/CVE-2020-8150",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-8150",
    "summary": "A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption scheme and break the integrity of encrypted files.",
    "evidence": "osv:CVE-2020-8150",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-8150",
      "aliases": [
        "CVE-2020-8150"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nextcloud/server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "8e877b7b17fc17be3e163640cc32f3e58bff8df5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "19.0.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v19.0.2RC2",
            "v19.0.2RC1",
            "v19.0.1",
            "v19.0.1RC1",
            "v19.0.0",
            "v19.0.0RC3",
            "v19.0.0RC1",
            "v19.0.0beta7",
            "v19.0.0beta6",
            "v19.0.0beta5",
            "v19.0.0beta4",
            "v19.0.0beta3",
            "v19.0.0beta2",
            "v19.0.0beta1",
            "v18.0.0RC1",
            "v18.0.0beta4",
            "v18.0.0beta3",
            "v18.0.0beta2",
            "v18.0.0beta1",
            "v17.0.0beta4",
            "v17.0.0beta3",
            "v17.0.0beta2",
            "v17.0.0beta1",
            "v16.0.0RC1",
            "v16.0.0beta3",
            "v16.0.0beta2",
            "v16.0.0beta1",
            "v16.0.0alpha1",
            "v15.0.0RC1",
            "v15.0.0beta2",
            "v15.0.0beta1",
            "v14.0.0RC2",
            "v14.0.0RC1",
            "v14.0.0beta4",
            "v14.0.0beta3",
            "v14.0.0beta2",
            "v14.0.0beta1",
            "v13.0.0RC1",
            "v13.0.0beta4",
            "v13.0.0beta3",
            "v13.0.0beta2",
            "v13.0.0beta1",
            "v12.0.0beta4",
            "v12.0.0beta3",
            "v12.0.0beta2",
            "v12.0.0beta1",
            "v11.0.0",
            "v11.0RC2",
            "v9.1.0beta1",
            "v9.0.0beta2",
            "v9.0beta1",
            "v8.2RC1",
            "v8.2beta1",
            "v8.1RC2",
            "v8.1.0beta2",
            "v8.1.0beta1",
            "v8.1.0alpha2",
            "v8.1.0alpha1",
            "v8.0.0",
            "v8.0.0RC2",
            "v8.0.0RC1",
            "v8.0.0beta2",
            "v8.0.0beta1",
            "v8.0.0alpha2",
            "v8.0.0alpha1",
            "v7.0.0beta1",
            "v7.0.0alpha2",
            "v6.0.0RC2",
            "v6.0.0RC1",
            "v6.0.0beta5",
            "v6.0.0beta4",
            "v6.0.0beta3",
            "v6.0.0beta2",
            "v6.0.0alpha2",
            "v5.0.0",
            "v5.0.0RC3",
            "v5.0.0RC2",
            "v5.0.0RC1",
            "v5.0.0beta2",
            "v5.0.0beta1",
            "v5.0.0alpha1",
            "v4.5.0",
            "v4.5.0RC3",
            "v4.5.0RC2",
            "v4.5.0RC1",
            "v4.5.0beta4",
            "v4.5.0beta3",
            "v4.0.6",
            "v4.0.5",
            "v4.0.4",
            "v4.0.1",
            "v4.0.0",
            "v4.0.0RC2",
            "v4.0.0RC",
            "v4.0.0beta",
            "v3.0",
            "v1.0.0beta1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-8150.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:30.486754065Z",
      "provider": "osv",
      "references": [
        "https://nextcloud.com/security/advisory/?id=NC-SA-2020-039",
        "https://hackerone.com/reports/742588"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-8150",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 432584,
  "published_at": "2020-11-09T15:15:13.443+00:00"
}