What is the CVSS score of CVE-2026-23515?

CVE-2026-23515 has a CVSS 3.1 base score of 9.9 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 5.0%.

Is there a public PoC exploit available for CVE-2026-23515?

Yes, a public proof-of-concept exploit is available for CVE-2026-23515. Prioritise patching immediately. EPSS: 5.0%.

How to fix or mitigate CVE-2026-23515?

Within 24 hours: Identify all Signal K Server instances in your environment and determine which have the set-system-time plugin enabled; isolate affected systems from critical networks if patching cannot be completed immediately. Within 7 days: Apply vendor patch to upgrade Signal K Server to version 1.5.0 or later on all instances; verify patch installation and restart services. Within 30 days: Conduct security audit of Signal K deployments, review access logs for suspicious activity, reset credentials for accounts with write permissions, and implement network segmentation to restrict Signal K server access.

Signal K Server CVE-2026-23515

CRITICAL

OS Command Injection (CWE-78)

2026-02-02 security-advisories@github.com

GHSA-p8gp-2w28-mhwg

Command Injection Signal K Server Signalk

9.9

CVSS 3.1 · GitHub Advisory

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Send crafted WebSocket delta message
Exploit

Inject shell commands in navigation.datetime value
Execution

set-system-time plugin processes unsafe command
Impact

Execute arbitrary shell commands on server

Vulnerability Assessment

Weakness	CWE CWE-78 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization OS command sanitization, avoid shell exec MITRE ATT&CK 2 techniques across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Signal K Server version prior to 1.5.0 with set-system-time plugin enabled. Requires either: (1) authenticated user with write permissions, OR (2) security disabled on the server allowing unauthenticated access via WebSocket.
Impact	CVSS 9.9, EPSS 4.96%. Maritime safety system — compromise could affect navigation data and alarms on vessels.
Exploit ScenarioDerived	Authenticated user on the boat's network injects commands through Signal K, gaining control of the navigation server and connected instruments.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

Patch available 5.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Command injection in Signal K Server (maritime navigation) before 1.5.0 allows authenticated users to execute OS commands. EPSS 4.96% with PoC and patch available.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:01 CVSS 9.9

Command injection in Signal K maritime navigation server.

RemediationAI

Update to Signal K Server 1.5.0.

Affected Packages

npm @signalk/set-system-time fix: 1.5.0

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in npm

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

CWE-78 in Signal K Server, which runs as central hub on boats. Authenticated command injection.

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Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 9.9 CRITICAL

AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Feb 27, 2026 - 13:46 vuln.today

Public exploit code

Patch released

Feb 27, 2026 - 13:46 nvd

Patch available

CVE Published

Feb 02, 2026 - 23:16 nvd

CRITICAL 9.9

DescriptionGitHub Advisory

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.

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

3 npm packages depend on @signalk/set-system-time (1 direct, 2 indirect)

Ecosystem-wide dependent count for version 1.5.0.

Executive ViewAI

Why It Matters

A critical command injection vulnerability in Signal K Server (CVE-2026-23515) allows authenticated users to execute arbitrary commands on marine navigation systems. Organizations operating Signal K deployments with the set-system-time plugin enabled face immediate risk of system compromise, data theft, and operational disruption on affected vessels.

Business Impact: Severe

Compensating Controls

Apply vendor patch. If immediate patching is unavailable: disable the set-system-time plugin on all Signal K instances; restrict network access to Signal K Server using firewall rules (allowlist known administrator IPs only); implement strict access control limiting write permissions to essential personnel only; monitor for suspicious command execution in system logs.

Threat Intelligence Overview

EPSS Score

5.0%

Top 10% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC Yes

EPSS 5.0%

Patch available Yes

Active threat No

Deciding rule

CRITICAL severity + public POC available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.