Actual Sync Server has an 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.
Mitigations
The vulnerability can be mitigated in prior versions by running the sync server in a filesystem sandbox.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @actual-app/sync-server | < 26.3.0 | 26.3.0 |
References
- https://github.com/actualbudget/actual/security/advisories/GHSA-27vg-33gh-4hwg
- https://nvd.nist.gov/vuln/detail/CVE-2026-3089
- https://github.com/actualbudget/actual/pull/7067
- https://github.com/actualbudget/actual/commit/18072e1d8b5281db43ded8b21433ee177bae9dfa
- https://fluidattacks.com/advisories/fugue
- https://github.com/actualbudget/actual
- CVSS 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- Weakness (CWE)
CWE-22- Platform
- npm
- Package
@actual-app/sync-server- Disclosed
- 10.03.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-27vg-33gh-4hwg - CC BY 4.0
Vulnerability history: @actual-app/sync-server
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 8
- First → latest
- 10.2025 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 3
- Medium 4
Disclosures per year
- 2025: 1
- 2026: 7
-
Actual Sync Server has an Authenticated Path Traversal this entry
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