CVE-2025-68620
published 2026-01-01CVE-2025-68620: Signal K Server is a server application that runs on a central hub in a boat. Versions prior to 2.19.0 expose two features that can be chained together to…
PriorityP269critical9.1CVSS 3.1
AVNACLPRNUINSUCHIHAN
EPSS
0.49%
38.5th percentile
Signal K Server is a server application that runs on a central hub in a boat. Versions prior to 2.19.0 expose two features that can be chained together to steal JWT authentication tokens without any prior authentication. The attack combines WebSocket-based request enumeration with unauthenticated polling of access request status. The first is Unauthenticated WebSocket Request Enumeration: When a WebSocket client connects to the SignalK stream endpoint with the `serverevents=all` query parameter, the server sends all cached server events including `ACCESS_REQUEST` events that contain details about pending access requests. The `startServerEvents` function iterates over `app.lastServerEvents` and writes each cached event to any connected client without verifying authorization level. Since WebSocket connections are allowed for readonly users (which includes unauthenticated users when `allow_readonly` is true), attackers receive these events containing request IDs, client identifiers, descriptions, requested permissions, and IP addresses. The second is Unauthenticated Token Polling: The access request status endpoint at `/signalk/v1/access/requests/:id` returns the full state of an access request without requiring authentication. When an administrator approves a request, the response includes the issued JWT token in plaintext. The `queryRequest` function returns the complete request object including the token field, and the REST endpoint uses readonly authentication, allowing unauthenticated access. An attacker has two paths to exploit these vulnerabilities. Either the attacker creates their own access request (using the IP spoofing vulnerability to craft a convincing spoofed request), then polls their own request ID until an administrator approves it, receiving the JWT token; or the attacker passively monitors the WebSocket stream to discover request IDs from legitimate devices, then polls those IDs and steals the JWT tokens when administrators approve them, hijacking l
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| signalk | signal_k_server | < 2.19.0 | 2.19.0 |
| signalk | signal_k_server | — | — |
| signalk | signalk-server | < 2.19.0 | 2.19.0 |
| signalk | signalk-server | >= 0 < 2.19.0 | 2.19.0 |
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OSV
Signal K Server vulnerable to JWT Token Theft via WebSocket Enumeration and Unauthenticated Polling
osv·2026-01-02
CVE-2025-68620 [CRITICAL] Signal K Server vulnerable to JWT Token Theft via WebSocket Enumeration and Unauthenticated Polling
Signal K Server vulnerable to JWT Token Theft via WebSocket Enumeration and Unauthenticated Polling
SignalK Server exposes two features that can be chained together to steal JWT authentication tokens without any prior authentication. The attack combines WebSocket-based request enumeration with unauthenticated polling of access request status.
**Unauthenticated WebSocket Request Enumeration**: When a WebSocket client connects to the SignalK stream endpoint with the `serverevents=all` query parameter, the server sends all cached server events including `ACCESS_REQUEST` events that contain details about pending access requests. The `startServerEvents` function iterates over `app.lastServerEvents` and writes each cached event to any connected client without verifying authorization level. Sin
GHSA
Signal K Server vulnerable to JWT Token Theft via WebSocket Enumeration and Unauthenticated Polling
ghsa·2026-01-02
CVE-2025-68620 [CRITICAL] CWE-288 Signal K Server vulnerable to JWT Token Theft via WebSocket Enumeration and Unauthenticated Polling
Signal K Server vulnerable to JWT Token Theft via WebSocket Enumeration and Unauthenticated Polling
SignalK Server exposes two features that can be chained together to steal JWT authentication tokens without any prior authentication. The attack combines WebSocket-based request enumeration with unauthenticated polling of access request status.
**Unauthenticated WebSocket Request Enumeration**: When a WebSocket client connects to the SignalK stream endpoint with the `serverevents=all` query parameter, the server sends all cached server events including `ACCESS_REQUEST` events that contain details about pending access requests. The `startServerEvents` function iterates over `app.lastServerEvents` and writes each cached event to any connected client without verifying authorization level. Sin
No detection rules found.
No public exploits indexed.
2026-01-01
Published