{"id":"CVE-2026-3089","aliases":["EUVD-2026-10340","GHSA-27vg-33gh-4hwg"],"status":"published","title":"Actual Sync Server 26.2.1 - Authenticated Path Traversal","description":"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.","severity":{"version":"4.0","score":5.3,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00416,"percentile":0.36195,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-22"],"published":"2026-03-09T14:08:55Z","modified":"2026-10-28T02:30:49Z","fixes":[{"ecosystem":"npm","package":"@actual-app/sync-server","fixed_in":["26.3.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@actual-app/sync-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"26.2.0"},{"fixed":"26.3.0"}]}]},{"source":"osv","ecosystem":"npm","package":"@actual-app/sync-server","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"26.3.0"}]}]}],"products":[{"vendor":"actual","product":"actual sync server"},{"vendor":"actualbudget","product":"actual"}],"references":[{"url":"https://fluidattacks.com/advisories/fugue","tags":["third-party-advisory","exploit","Exploit","Third Party Advisory","advisory","web"]},{"url":"https://github.com/actualbudget/actual","tags":["product","Product","package"]},{"url":"https://github.com/actualbudget/actual/pull/7067","tags":["patch","Issue Tracking","Patch","fix","web"]},{"url":"https://github.com/actualbudget/actual/security/advisories/GHSA-27vg-33gh-4hwg","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3089","tags":["advisory"]},{"url":"https://github.com/actualbudget/actual/commit/18072e1d8b5281db43ded8b21433ee177bae9dfa","tags":["web"]},{"url":"https://github.com/advisories/GHSA-27vg-33gh-4hwg"},{"url":"https://registry.npmjs.org","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3089.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-3089","title":"Actual Sync Server 26.2.1 - Authenticated Path Traversal","description":"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.","status":"published","published":"2026-03-09T14:08:55.998Z","modified":"2026-03-09T14:54:24.136Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium","assessor":"cna"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T13:48:58.05327Z"}],"euvd":[{"id":"EUVD-2026-10340","description":"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.","status":"published","published":"2026-03-09T14:08:55Z","modified":"2026-03-09T14:54:24Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium"}],"updated_at":"2026-11-02T19:48:07.128863Z"}],"ghsa":[{"id":"GHSA-27vg-33gh-4hwg","title":"Actual Sync Server has an Authenticated Path Traversal","description":"# 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.","status":"published","published":"2026-03-10T01:02:15Z","modified":"2026-03-10T01:02:16Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:39:33.538417Z"}],"nvd":[{"id":"CVE-2026-3089","description":"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.","status":"published","published":"2026-03-09T14:16:10.143Z","modified":"2026-06-17T10:43:01.84Z","cvss":[{"version":"4.0","score":5.3,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:12:08.279852Z"}],"osv":[{"id":"CVE-2026-3089","title":"Actual Sync Server 26.2.1 - Authenticated Path Traversal","description":"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.","status":"published","published":"2026-03-09T14:08:55.998Z","modified":"2026-10-28T02:30:49.503265588Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:45:00.861953Z"},{"id":"GHSA-27vg-33gh-4hwg","title":"Actual Sync Server has an Authenticated Path Traversal","description":"# 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.","status":"published","published":"2026-03-10T01:02:15Z","modified":"2026-03-10T01:26:18.862998Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:46:33.956911Z"}]}}