CVE-2026-3089 Details
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.
A path traversal vulnerability has been identified in Actual Sync Server versions prior to 26.3.0. This issue allows authenticated users to upload files through the POST /sync/upload-user-file endpoint. The vulnerability arises from improper validation of the user-controlled x-actual-file-id header, which can be manipulated to escape the intended directory and write files outside the designated userFiles directory. Additionally, the vulnerability could be exploited to write files to arbitrary locations on the server, such as the /tmp directory.
Users can update to Actual Sync Server version 26.3.0 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 9, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://fluidattacks.com/advisories/fugue | CISA-ADP | ExploitThird Party Advisory |
| https://fluidattacks.com/advisories/fugue | [email protected] | ExploitThird Party Advisory |
| https://github.com/actualbudget/actual | [email protected] | Product |
| https://github.com/actualbudget/actual/pull/7067 | [email protected] | Issue TrackingPatch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| actualbudget actual | < 26.3.0 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 9, 2026 | Initial Analysis | [email protected] |
| Mar 9, 2026 | CVE Modified | CISA-ADP |
| Mar 9, 2026 | New CVE Received | [email protected] |