Security advisory

{
  "id": "9a18699f9aaf3988071a74a06c05a2bbe52a098365294e445a7342bd4f891e67",
  "url": "https://osv.dev/vulnerability/CVE-2021-39224",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-39224",
    "summary": "Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud OfficeOnline application prior to version 1.1.1 returned verbatim exception messages to the user. This could result in a full path disclosure on shared files. (e.g. an attacker could see that the file `shared.txt` is located within `/files/$username/Myfolder/Mysubfolder/shared.txt`). It is recommended that the OfficeOnline application is upgraded to 1.1.1. As a workaround, one may disable the OfficeOnline application in the app settings.",
    "evidence": "osv:CVE-2021-39224",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-39224",
      "aliases": [
        "CVE-2021-39224",
        "GHSA-56wm-r6jm-3v9h"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nextcloud/officeonline",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6b92dde15c1816ea856f6d99fb28397c0f147205"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nextcloud:officeonline:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.1.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.1.0",
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0",
            "v1.0.0-alpha1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-39224.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:57.158171845Z",
      "provider": "osv",
      "references": [
        "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-56wm-r6jm-3v9h",
        "https://github.com/nextcloud/officeonline/pull/204"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-39224",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386529,
  "published_at": "2021-10-25T22:15:07.577+00:00"
}