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

Quick assessment

Affected
SignalK signalk-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Signal K Server是Signal K开源的一个船用中央服务器。 Signal K Server 2.25.0之前版本存在安全漏洞，该漏洞源于WebSocket登录路径未实施速率限制，可能导致攻击者绕过HTTP速率限制进行无限密码猜测。

AI Predicted 5.9 Difficulty: Easy EPSS 0.33% · P25

Possible ATT&CK Techniques 1 AI

T1110.003 · Password Spraying

Affected Version Matrix 1

VendorProduct Version RangeStatus
SignalK signalk-server < 2.25.0 affected
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I. Basic Information for CVE-2026-41893

Vulnerability Information
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Vulnerability Title
Signal K Server's WebSocket Login Endpoint Lacks Rate Limiting (Credential Brute-Force)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
过多认证尝试的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Signal K Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Signal K Server是Signal K开源的一个船用中央服务器。 Signal K Server 2.25.0之前版本存在安全漏洞，该漏洞源于WebSocket登录路径未实施速率限制，可能导致攻击者绕过HTTP速率限制进行无限密码猜测。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
SignalK signalk-server < 2.25.0 -

II. Public POCs for CVE-2026-41893

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III. Intelligence Information for CVE-2026-41893

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Patches & Fixes for CVE-2026-41893 (1)

Vendor Advisories for CVE-2026-41893 (1)

IV. Related Vulnerabilities

Same product: signalk-server
Same vendor: SignalK
Same weakness: CWE-307

V. Comments for CVE-2026-41893

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