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    CVE-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 outside userFiles.This issue affects prior versions of Actual Sync Server 26.3.0.

    Published:Mar 9, 2026
    Last Modified:Apr 17, 2026
    EPS:Mar 9, 2026
    EPSS Score:0.00016
    CVSS Score:6.5

    Affected Products

    Vendor
    Actual
    Product
    Actual Sync Server
    Vendor
    Actualbudget
    Product
    Actual

    Exploits

    https://fluidattacks.com/advisories/fuguehttps://fluidattacks.com/advisories/fugue

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High