RCE - Command Injection in Signal K set-system-time plugin

published 2026-02-02 9 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-5282 , GHSA-p8gp-2w28-mhwg

cvss: 10.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 4.5%; EPSS 4.5% chance of exploitation in 30 days, percentile 91%
public exploits: 0; none known

Signal K Server is a server application that runs on a central hub in a boat. Prior to 1.5.0, a command injection vulnerability allows authenticated users with write permissions to execute arbitrary shell commands on the Signal K server when the set-system-time plugin is enabled. Unauthenticated users can also exploit this vulnerability if security is disabled on the Signal K server. This occurs due to unsafe construction of shell commands when processing navigation.datetime values received via WebSocket delta messages. This vulnerability is fixed in 1.5.0.

Patch / fix

fixed in 2 links 1

npm @signalk/set-system-time 1.5.0
signalk signal_k_server 1.5.0

github.com/SignalK/set-system-time@75b11ea commit

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 9 mo ago (2026-02-03)

Exploit prediction

4.52% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/SignalK/signalk-server/security/advisories/GHSA-p8gp-2w28-mhwg referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	10.0	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
GitHub	3.1	9.9	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	@signalk/set-system-time	<1.5.0	1.5.0

Affected products

SignalK signalk-server

Classification

Weakness

CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

github.com /SignalK/set-system-time/commit/75b11eae2de528bf89ede3fb1f7ed057ddbb4d24
web, patch
github.com /SignalK/signalk-server/security/advisories/GHSA-p8gp-2w28-mhwg
web, exploit, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2026-23515
advisory
github.com /SignalK/signalk-server
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary