Notes attachment render HTML in preview mode

{
  "id": "74cc4bfe4e37a284ae908567ffe57904474a6b0939a545a1130407e621a29d4a",
  "url": "https://osv.dev/vulnerability/CVE-2023-39955",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Notes attachment render HTML in preview mode",
    "summary": "Notes is a note-taking app for Nextcloud, an open-source cloud platform. Starting in version 4.4.0 and prior to version 4.8.0, when creating a note file with HTML, the content is rendered in the preview instead of the file being offered to download. Nextcloud Notes app version 4.8.0 contains a patch for the issue. No known workarounds are available.",
    "evidence": "osv:CVE-2023-39955",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2023-39955",
      "aliases": [
        "CVE-2023-39955",
        "GHSA-6g88-37x7-4vw6"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nextcloud/notes",
              "type": "GIT",
              "events": [
                {
                  "introduced": "aa547d01617d5e0fb0a9a783714e3f9b9d73a430"
                },
                {
                  "fixed": "50e881eb151ec5b94fa2bfe0b94c5cd3bbc2acc7"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "4.4.0"
                      },
                      {
                        "fixed": "4.8.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:nextcloud:notes:*:*:*:*:*:nextcloud:*:*",
                    "range": [
                      {
                        "introduced": "4.4.0"
                      },
                      {
                        "fixed": "4.8.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.8.0-beta.2",
            "v4.8.0-beta.1",
            "v4.7.2",
            "v4.7.1",
            "v4.7.0",
            "v4.6.0",
            "v4.5.1",
            "v4.5.0",
            "v4.4.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-39955.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.294930618Z",
      "provider": "osv",
      "references": [
        "https://hackerone.com/reports/1924355",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/39xxx/CVE-2023-39955.json",
        "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6g88-37x7-4vw6",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-39955",
        "https://github.com/nextcloud/notes/pull/1031"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/39xxx/CVE-2023-39955.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-39955",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521014,
  "published_at": "2023-08-10T14:53:42.626+00:00"
}