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CVE-2026-41893

Estado: AnalizadaAlta (8.7)—

Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.25.0, 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 bypass HTTP rate limiting entirely by opening a WebSocket connection and attempting unlimited password guesses at the speed bcrypt allows (~20 attempts/sec with 10 salt rounds). This issue has been patched in version 2.25.0.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Acceso remoto sin autenticación a endpoint expuesto (WebSocket /login) con bypass de rate limiting permite ataques de fuerza bruta contra credenciales. CWE-307 (credenciales débiles) + VI:H confirma impacto de integridad por acceso no autorizado.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Password PoliciesMulti-factor AuthenticationUpdate SoftwareVulnerability ScanningPrivileged Account ManagementNetwork Segmentation

Tecnologías afectadas (1)

Signalk — Signal K Server

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2026-41893",
  "cveTags": [],
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "id": "CVE-2026-41893",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-05-14T17:50:07.187900Z"
        }
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        "source": "nvd@nist.gov",
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          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
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          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
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    ],
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          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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      "affectedData": [
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          "versions": [
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              "status": "affected",
              "version": "< 2.25.0"
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  "published": "2026-05-09T20:16:27.273",
  "references": [
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      "url": "https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d",
      "tags": [
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      "url": "https://github.com/SignalK/signalk-server/pull/2568",
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    {
      "url": "https://github.com/SignalK/signalk-server/releases/tag/v2.25.0",
      "tags": [
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
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          "value": "CWE-307"
        }
      ]
    }
  ],
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      "lang": "en",
      "value": "Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.25.0, 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 bypass HTTP rate limiting entirely by opening a WebSocket connection and attempting unlimited password guesses at the speed bcrypt allows (~20 attempts/sec with 10 salt rounds). This issue has been patched in version 2.25.0."
    },
    {
      "lang": "es",
      "value": "Signal K Server es una aplicación de servidor que se ejecuta en un concentrador central en una embarcación. Antes de la versión 2.25.0, los puntos finales de inicio de sesión HTTP (POST /login y POST /signalk/v1/auth/login) están protegidos por express-rate-limit (predeterminado: 100 intentos por ventana de 10 minutos, configurable a través de HTTP_RATE_LIMITS). La ruta de inicio de sesión de WebSocket - enviando mensajes {login: {username, password}} a través de una conexión WebSocket establecida - llama directamente a app.securityStrategy.login() sin ninguna limitación de velocidad. Un atacante puede eludir completamente la limitación de velocidad HTTP abriendo una conexión WebSocket e intentando un número ilimitado de conjeturas de contraseña a la velocidad que permite bcrypt (~20 intentos/seg con 10 rondas de sal). Este problema ha sido parcheado en la versión 2.25.0."
    }
  ],
  "lastModified": "2026-07-24T19:10:00.160",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "2.25.0"
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          "operator": "OR"
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}