Actual Sync Server 26.2.1 - Authenticated Path Traversal

{
  "id": "c6f6dc4290c9b24a1d26aaf03d367b56c6e23c0d9a314490238769991e0025fd",
  "url": "https://osv.dev/vulnerability/CVE-2026-3089",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Actual Sync Server 26.2.1 - Authenticated Path Traversal",
    "summary": "Actual Sync Server allows authenticated users to upload files through POST /sync/upload-user-file. In versions prior to 26.3.0, improper validation of the user-controlled x-actual-file-id header means that traversal segments (../) can escape the intended directory and write files outside userFiles.This issue affects prior versions of Actual Sync Server 26.3.0.",
    "evidence": "osv:CVE-2026-3089",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-3089",
      "aliases": [
        "CVE-2026-3089",
        "GHSA-27vg-33gh-4hwg"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/actualbudget/actual",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0f77d333ca2609a2401413a6d4a2ffa6f89d760b"
                },
                {
                  "fixed": "f9e09ca59b06bf9cc495feeedeac778a257fdfa5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "26.2.1"
                      },
                      {
                        "last_affected": "26.2.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "cpe": "cpe:2.3:a:actualbudget:actual:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "26.3.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "26.2.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-3089.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.503265588Z",
      "provider": "osv",
      "references": [
        "https://registry.npmjs.org",
        "https://fluidattacks.com/advisories/fugue",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3089.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-3089",
        "https://github.com/actualbudget/actual/pull/7067",
        "https://github.com/actualbudget/actual"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "Fluid Attacks",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3089.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-3089",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517944,
  "published_at": "2026-03-09T14:08:55.998+00:00"
}