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    CVE-2026-25228

    Signal K Server is a server application that runs on a central hub in a boat. Prior to 2.20.3, a path traversal vulnerability in SignalK Server's applicationData API allows authenticated users on Windows systems to read, write, and list arbitrary files and directories on the filesystem. The validateAppId() function blocks forward slashes (/) but not backslashes (\), which are treated as directory separators by path.join() on Windows. This enables attackers to escape the intended applicationData directory. This vulnerability is fixed in 2.20.3.

    Published:Feb 2, 2026
    Last Modified:Apr 18, 2026
    EPS:Feb 2, 2026
    EPSS Score:0.00018
    CVSS Score:5

    Affected Products

    Vendor
    Microsoft
    Product
    Windows
    Vendor
    Signalk
    Product
    Signal K Server
    Vendor
    Signalk
    Product
    Signalk-server

    Exploits

    https://github.com/SignalK/signalk-server/security/advisories/GHSA-vrhw-v2hw-jffx

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    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