What’s Vulnerable › Vulnerabilities

CVE-2026-33951: signalk-server: Unauthenticated Source Priorities Manipulation

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-02 · updated 2026-07-24
• Weakness: CWE-284

Description

Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.24.0-beta.1, the SignalK Server exposes an unauthenticated HTTP endpoint that allows remote attackers to modify navigation data source priorities. This endpoint, accessible via PUT /signalk/v1/api/sourcePriorities, does not enforce authentication or authorization checks and directly assigns user-controlled input to the server configuration. As a result, attackers can influence which GPS, AIS, or other sensor data sources are trusted by the system. The changes are immediately applied and persisted to disk, allowing the manipulation to survive server restarts. This issue has been patched in version 2.24.0-beta.1.

Affected products

• signalk-server: before 2.24.0 — fixed in 2.24.0

How to fix

Upgrade to a fixed version: signalk-server 2.24.0. Check the vendor advisory for mitigations.

References

• https://github.com/SignalK/signalk-server/releases/tag/v2.24.0-beta.1
• https://github.com/SignalK/signalk-server/security/advisories/GHSA-gfmv-vh34-h2x5

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