Security advisory

{
  "id": "1ad350dcc89de256ddc9130456ccef4eafe41c3101a4796fd9b61cc4216baa2f",
  "url": "https://osv.dev/vulnerability/CVE-2021-39609",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-39609",
    "summary": "Cross Site Scripting (XSS) vulnerability exiss in FlatCore-CMS 2.0.7 via the upload image function.",
    "evidence": "osv:CVE-2021-39609",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-39609",
      "aliases": [
        "CVE-2021-39609"
      ],
      "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/flatcore/flatcore-cms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "5b7a0216e07d710f8d75a654134de9ead3cc086e"
                },
                {
                  "last_affected": "5b7a0216e07d710f8d75a654134de9ead3cc086e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:flatcore:flatcore-cms:2.0.7:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.0.7"
                      },
                      {
                        "last_affected": "2.0.7"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.0.7",
            "v2.0.7"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-39609.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:54.681254497Z",
      "provider": "osv",
      "references": [
        "https://github.com/flatCore/flatCore-CMS/issues/53",
        "https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-39609",
        "https://www.nu11secur1ty.com/2021/08/cve-2021-39609.html"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-39609",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386441,
  "published_at": "2021-08-23T21:15:10.617+00:00"
}