Signal K Server's WebSocket Login Endpoint Lacks Rate Limiting (Credential Brute-Force) — CVE-2026-41893

Summary

## Summary The HTTP login endpoints (`POST /login` and `POST /signalk/v1/auth/login`) are protected by `express-rate-limit` (default: 100 attempts per 10-minute window, configurable via `HTTP_RATE_LIMITS`). The WebSocket login path — sending `{login: {username, password}}` messages over an established WebSocket connection — calls `app.securityStrategy.login()` directly without any rate limiting. An attacker can…

Product

npm: signalk-server

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

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