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Medium

Security advisory

Type: advisorySources: OSVCVE: CVE-2021-39221

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Contacts application prior to version 4.0.3 was vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. For exploitation, a user would need to right-click on a malicious file and open the file in a new tab. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Contacts application is upgraded to 4.0.3. As a workaround, one may use a browser that has support for Content-Security-Policy.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2021-39221
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 11:53 UTC · Revision 1

Source evidence

CVE-2021-39221

core-osv · Original source

Published 25 Oct 2021, 19:15 UTC

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Contacts application prior to version 4.0.3 was vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. For exploitation, a user would need to right-click on a malicious file and open the file in a new tab. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Contacts application is upgraded to 4.0.3. As a workaround, one may use a browser that has support for Content-Security-Policy.

osv:CVE-2021-39221
Complete source record
{
  "id": "5b6f836ac6a4a67bdebdeb0194bdadcdbbacf74b667da2d6ae2adc44e68fff22",
  "url": "https://osv.dev/vulnerability/CVE-2021-39221",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-39221",
    "summary": "Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Contacts application prior to version 4.0.3 was vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. For exploitation, a user would need to right-click on a malicious file and open the file in a new tab. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Contacts application is upgraded to 4.0.3. As a workaround, one may use a browser that has support for Content-Security-Policy.",
    "evidence": "osv:CVE-2021-39221",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-39221",
      "aliases": [
        "CVE-2021-39221",
        "GHSA-j6cx-mxqf-f9vc"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nextcloud/contacts",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "ca6b1e05e25534e6d7eba80d4dce6a215ec06053"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nextcloud:contacts:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.0.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.0.2",
            "v4.0.0",
            "v4.0.0-rc.0",
            "v4.0.0-beta.3",
            "v4.0.0-beta.2",
            "v3.5.1",
            "v3.5.0",
            "v3.4.3",
            "v3.4.2",
            "v3.4.1",
            "v3.4.0",
            "v3.3.0",
            "v3.2.0",
            "v3.1.9",
            "v3.1.6",
            "v3.1.5",
            "v3.1.4",
            "v3.1.3",
            "v3.1.2",
            "v3.1.1",
            "v3.1.0",
            "v3.0.1",
            "v3.0.0",
            "v3.0.0-beta1",
            "v3.0.0-alpha1",
            "v2.1.6-beta",
            "v2.1.6",
            "v2.1.5",
            "v2.1.4",
            "v2.1.3",
            "v2.1.2",
            "v2.1.1",
            "v2.1.0",
            "v2.0.1",
            "2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-39221.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:53.697928441Z",
      "provider": "osv",
      "references": [
        "https://github.com/nextcloud/contacts/pull/2407",
        "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-j6cx-mxqf-f9vc"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-39221",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386389,
  "published_at": "2021-10-25T19:15:09.73+00:00"
}