Security advisory

{
  "id": "39d286f3018860a4d8b8287cbd7112bdcfba1b2f31fa0e4fb9075fb219c18fb5",
  "url": "https://osv.dev/vulnerability/CVE-2025-51661",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2025-51661",
    "summary": "A path Traversal vulnerability found in FileCodeBox v2.2 and earlier allows arbitrary file writes when application is configured to use local filesystem storage. SystemFileStorage.save_file method in core/storage.py uses filenames from user input without validation to construct save_path and save files. This allows remote attackers to perform arbitrary file writes outside the intended directory by sending crafted POST requests with malicious traversal sequences to /share/file/ upload endpoint, which does not require any authorization.",
    "evidence": "osv:CVE-2025-51661",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-51661",
      "aliases": [
        "CVE-2025-51661"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/vastsa/filecodebox",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "17331112b43c1d97256e2d8e7e16d76e3b0a3b60"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.2"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "cpe": "cpe:2.3:a:lanol:filecodebox:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.2",
            "V2.1",
            "V2.0",
            "V1.7Beta",
            "V1.6",
            "V1.5.9.2",
            "V1.5.9.1",
            "V1.5.9",
            "V1.5.6",
            "V1.5.7",
            "V1.5.4",
            "V1.5.3",
            "V1.5.2",
            "V1.5.1",
            "V1.4.5",
            "V1.4",
            "V1.4.4",
            "V1.4.3",
            "V1.4.1",
            "V1.2",
            "V1.1",
            "Main"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-51661.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.976856408Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/51xxx/CVE-2025-51661.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-51661",
        "https://github.com/vastsa/FileCodeBox/issues/349",
        "https://github.com/vastsa/FileCodeBox"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/51xxx/CVE-2025-51661.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-51661",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496642,
  "published_at": "2025-11-19T00:00:00+00:00"
}