CVE-2026-25228

MEDIUM

Signal K Server < 2.20.3 - Authenticated Path Traversal via Backslash Bypass

Title source: llm
STIX 2.1

Description

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.

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