| Package | Affected versions | Patched versions |
|---|---|---|
| actual | < 26.3.0 | 26.3.0 |
| @actual-app/sync-server | < 26.3.0 | 26.3.0 |
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.
The vulnerability can be mitigated in prior versions by running the sync server in a filesystem sandbox.
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