CVE-2026-25228
MEDIUMSignal K Server < 2.20.3 - Authenticated Path Traversal via Backslash Bypass
Title source: llmDescription
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.
References (2)
Core 2
Core References
Vendor Advisory x_refsource_confirm
https://github.com/SignalK/signalk-server/security/advisories/GHSA-vrhw-v2hw-jffx
Scores
CVSS v3
5.0
EPSS
0.0002
EPSS Percentile
5.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-22
Status
published
Products (2)
npm/signalk-server
0 - 2.20.3npm
signalk/signal_k_server
< 2.20.3
Published
Feb 02, 2026
Tracked Since
Feb 18, 2026