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 outsid...

CVE-2026-3089 Actual Sync Server 26.2.1 - Authenticated Path Traversal

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...