---
title: "CVE-2026-23515: Signal K set-system-time plugin vulnerable to RCE - Command Injection"
url: https://erroneo.us/security/cve/CVE-2026-23515/
description: "CVE-2026-23515 (@signalk/set-system-time (npm)): Signal K Server is a server application that runs on a central hub in a boat. Prior to 1.5.0, a command…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-02-02
date_modified: 2026-02-03
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-23515"
kev: false
cvss: 10
epss: 0.04586
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-23515: Signal K set-system-time plugin vulnerable to RCE - Command Injection

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 4.6% , percentile 92: FIRST’s model estimates a 4.6% chance of exploitation activity in the next 30 days, higher than 92% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes @signalk/set-system-time (npm) < 1.5.0, fixed in 1.5.0 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- npm `@signalk/set-system-time` < 1.5.0 → fixed: 1.5.0

## Affected products (CVE record)

- SignalK signalk-server: < 1.5.0

## Severity

- GitHub_M CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.9 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 4.59% probability of exploitation activity in the next 30 days; percentile 92.

## Sources

- [GitHub Advisory GHSA-p8gp-2w28-mhwg](https://github.com/advisories/GHSA-p8gp-2w28-mhwg)
- [CVE.org record CVE-2026-23515](https://www.cve.org/CVERecord?id=CVE-2026-23515)
- [NVD entry CVE-2026-23515](https://nvd.nist.gov/vuln/detail/CVE-2026-23515)
- [github.com](https://github.com/SignalK/signalk-server/security/advisories/GHSA-p8gp-2w28-mhwg)
- [github.com](https://github.com/SignalK/set-system-time/commit/75b11eae2de528bf89ede3fb1f7ed057ddbb4d24)

---
Source page: https://erroneo.us/security/cve/CVE-2026-23515/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt