{"id":"GHSA-27vg-33gh-4hwg","summary":"Actual Sync Server has an Authenticated Path Traversal","details":"# Description\n\nActual 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`.\n\n## Mitigations\nThe vulnerability can be mitigated in prior versions by running the sync server in a filesystem sandbox.","aliases":["CVE-2026-3089"],"modified":"2026-03-10T01:26:18.862998Z","published":"2026-03-10T01:02:15Z","database_specific":{"cwe_ids":["CWE-22"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-03-10T01:02:15Z","nvd_published_at":"2026-03-09T14:16:10Z"},"references":[{"type":"WEB","url":"https://github.com/actualbudget/actual/security/advisories/GHSA-27vg-33gh-4hwg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3089"},{"type":"WEB","url":"https://github.com/actualbudget/actual/pull/7067"},{"type":"WEB","url":"https://github.com/actualbudget/actual/commit/18072e1d8b5281db43ded8b21433ee177bae9dfa"},{"type":"WEB","url":"https://fluidattacks.com/advisories/fugue"},{"type":"PACKAGE","url":"https://github.com/actualbudget/actual"}],"affected":[{"package":{"name":"@actual-app/sync-server","ecosystem":"npm","purl":"pkg:npm/%40actual-app/sync-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"26.3.0"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 26.2.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-27vg-33gh-4hwg/GHSA-27vg-33gh-4hwg.json"}}],"schema_version":"1.9.0","severity":[{"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"}]}