GHSA-fq56-hvg6-wvm5 · 深刻度： critical · エコシステム： npm — Signal K Server vulnerable to JWT Token Theft via WebSocket Enumeration and Unauthenticated Polling
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 legitimate device credentials. Both paths require zero authentication and enable complete authentication bypass. Version 2.19.0 fixes the underlying issues.
総合評価: CVE-2025-68620 は悪用リスクが高い（65.2/100）。CVSS 深刻度は重大。悪用される可能性が高い（EPSS 0.49%、38 パーセンタイル） 根拠: 公開エクスプロイトが 1 件参照されています（Exploit-DB）。 推奨対応: 公開エクスプロイトが確認されています。影響範囲の確認、緩和策の適用、パッチ適用を優先してください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
| EDB-ID | ソース | 種別 | 公開 | リンク |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.06% | 0.49% | +0.43% |
| 2 | 2026-02-18 | 0.18% | 0.06% | -0.12% |
| 3 | 2026-02-12 | — | 0.18% | — |
EPSS の全履歴 （全 5 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 9.1 | 3.1 | CRITICAL |
|
3.9 | 5.2 | [email protected] |
GHSA-fq56-hvg6-wvm5 · 深刻度： critical · エコシステム： npm — Signal K Server vulnerable to JWT Token Theft via WebSocket Enumeration and Unauthenticated Polling
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| signalk | signal_k_server | < 2.19.0 | cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:* |
| signalk | signal_k_server | 2.19.0 | cpe:2.3:a:signalk:signal_k_server:2.19.0:beta1:*:*:*:*:*:* |
| signalk | signal_k_server | 2.19.0 | cpe:2.3:a:signalk:signal_k_server:2.19.0:beta2:*:*:*:*:*:* |
| signalk | signal_k_server | 2.19.0 | cpe:2.3:a:signalk:signal_k_server:2.19.0:beta3:*:*:*:*:*:* |
| signalk | signal_k_server | 2.19.0 | cpe:2.3:a:signalk:signal_k_server:2.19.0:beta4:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://github.com/SignalK/signalk-server/releases/tag/v2.19.0 | Release Notes |
| https://github.com/SignalK/signalk-server/security/advisories/GHSA-fq56-hvg6-wvm5 | Exploit Vendor Advisory |