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.

• CWE-22

• https://github.com/SignalK/signalk-server/commit/9bcf61c8fe2cb8a40998b913a02fb64dff9e86c7Patch
• https://github.com/SignalK/signalk-server/security/advisories/GHSA-vrhw-v2hw-jffxExploit, Mitigation, Vendor Advisory

Published

Feb 2, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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