CVE-2026-3089 in Sync Server

Sumário

de MITRE • 09/03/2026

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.

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• Responsável: Fluid Attacks
• Reservar: 24/02/2026
• Divulgação: 09/03/2026
• Moderação: aceite
• Entrada: VDB-349831
• CPE: pronto
• CWE: CWE-22 (confirmado)
• CVSS: 5.4 (VulDB)
• EPSS: 0.00018
• KEV: não
• Atividades: muito baixo

Fontes

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-3089
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3089
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-3089/