Signal K Server’s WebSocket Login Endpoint Lacks Rate Limiting (Credential Brute-Force)_CVE-2026-41893

{
    "lastseen": "",
    "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 \u2014 sending {login: {username, password}} messages over an established WebSocket connection \u2014 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.",
    "published": "2026-05-09T19:12:10.082Z",
    "modified": "2026-05-09T19:12:10.082Z",
    "type": "cve",
    "title": "Signal K Server's WebSocket Login Endpoint Lacks Rate Limiting (Credential Brute-Force)",
    "source": "GitHub_M",
    "references": "https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g\nhttps://github.com/SignalK/signalk-server/pull/2568\nhttps://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d\nhttps://github.com/SignalK/signalk-server/releases/tag/v2.25.0",
    "id": "CVE-2026-41893",
    "bulletinFamily": "",
    "cwe": [
        "CWE-307"
    ],
    "cvelist": null,
    "sourceData": "SignalK signalk-server < 2.25.0",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "signalk-server",
    "version": "< 2.25.0",
    "vendor": "SignalK",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}