Security advisory

{
  "id": "8dc1235bdfe63b59fec9423fc81fd41bec44c3b36c888563c44dad243fd67d84",
  "url": "https://osv.dev/vulnerability/CVE-2021-28931",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-28931",
    "summary": "Arbitrary file upload vulnerability in Fork CMS 5.9.2 allows attackers to create or replace arbitrary files in the /themes directory via a crafted zip file uploaded to the Themes panel.",
    "evidence": "osv:CVE-2021-28931",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-28931",
      "aliases": [
        "CVE-2021-28931",
        "GHSA-748f-wv76-x9hg"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/forkcms/forkcms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "2cc9248584a96e4d7e71468da000fdd2e65a5d7d"
                },
                {
                  "last_affected": "2cc9248584a96e4d7e71468da000fdd2e65a5d7d"
                },
                {
                  "fixed": "2cc9248584a96e4d7e71468da000fdd2e65a5d7d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:fork-cms:fork_cms:5.9.2:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.9.2"
                      },
                      {
                        "last_affected": "5.9.2"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "range": [
                      {
                        "fixed": "2cc9248584a96e4d7e71468da000fdd2e65a5d7d"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "5.9.2"
                  }
                ]
              }
            }
          ],
          "versions": [
            "5.9.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-28931.json"
          }
        }
      ],
      "modified": "2026-10-24T10:50:07.509317021Z",
      "provider": "osv",
      "references": [
        "https://github.com/bousalman/ForkCMS-arbitrary-upload/blob/main/README.md",
        "https://github.com/forkcms/forkcms/releases/tag/5.9.2"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:fork-cms:fork_cms:5.9.2:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fork-cms:fork_cms",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "5.9.2"
                  },
                  {
                    "last_affected": "5.9.2"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-28931",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 441979,
  "published_at": "2021-07-07T15:15:08.12+00:00"
}