Actual Sync Server allows authenticated users to upload files through POST /sync/upload-user-file.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Mar 9, 2026 · NIST NVD

   Detected

   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.

2. Jun 17, 2026 · NIST NVD

   Updated

   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.

Affected

• cpe actualbudget/actualversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-3089

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-3089

  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

  nvd.nist.gov

References

• Exploit · fluidattacks.com
• Product · github.com
• Issue Tracking · github.com