CVE-2026-23515 RCE - Command Injection in Signal K set-system-time plugin
Authenticated users or unauthenticated users with disabled security can execute arbitrary shell commands via WebSocket messages in the set-system-time plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23515?
CVE-2026-23515 is a critical command injection vulnerability in signalk-server, published on 2 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-78
Which versions are affected by CVE-2026-23515?
2 open source packages ship an affected version, including @signalk/set-system-time. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@signalk/set-system-time npm | All versions | 1.5.0 |
@signalk/set-system-time npm | All versions | 1.5.0 |
Products include Signalk Signal K Server.
How do I fix CVE-2026-23515?
Upgrade @signalk/set-system-time to 1.5.0 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-23515 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-23515 exists.
Other vulnerabilities in signalk-server
- CVE-2025-66398 Signal K Server has Unauthenticated State Pollution leading to Remote Code Execution (RCE)
- CVE-2026-33950 signalk-server: Privilege Escalation by Admin Role Injection via /enableSecurity
- CVE-2025-68620 Signal K Server vulnerable to JWT Token Theft via WebSocket Enumeration and Unauthenticated Polling
- CVE-2026-41893 Signal K Server's WebSocket Login Endpoint Lacks Rate Limiting (Credential Brute-Force)
- CVE-2026-39320 Signal K Server has an Unauthenticated Regular Expression Denial of Service (ReDoS) via WebSocket Subscription Paths
Sources
Also known as GHSA-p8gp-2w28-mhwg.