Path Traversal in Microsoft Windows
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (36.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: -0.000
Affected products
- Microsoft Windows
- Signalk Signal K Server
- Signalk Signalk-Server — versions < 2.20.3
Weakness classification (CWE)
References
- github.com/SignalK/signalk-server/security/advisories/GHSA-vrhw-v2hw-jffx (Exploit, Mitigation, Vendor Advisory)
- github.com/SignalK/signalk-server/commit/9bcf61c8fe2cb8a40998b913a02fb64dff9e86… (Patch)
Frequently asked questions
- What is CVE-2026-25228?
- CVE-2026-25228 is a medium-severity vulnerability in Microsoft Windows, classified under Path Traversal. CVSS score: 5.0/10. Published 2026-02-02.
- How severe is CVE-2026-25228?
- Medium severity. CVSS v3 base score is 5.0 out of 10.