{"id":"CVE-2026-41893","aliases":["GHSA-vmfm-ch9h-5c7g"],"url":"https://o3.security/vulnerability/CVE-2026-41893","summary":"Signal K Server's WebSocket Login Endpoint Lacks Rate Limiting (Credential Brute-Force)","details":"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.","published":"2026-05-09T19:12:10.082Z","modified":"2026-09-17T03:45:13.242886439Z","cvss":null,"epss":{"score":0.00327,"percentile":0.25835,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"signalk-server","fixedVersion":"2.25.0"}],"fix":{"url":"https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d","label":"SignalK/signalk-server@215d81e"},"references":[{"type":"WEB","url":"https://github.com/SignalK/signalk-server/releases/tag/v2.25.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41893.json"},{"type":"ADVISORY","url":"https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41893"},{"type":"FIX","url":"https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d"},{"type":"FIX","url":"https://github.com/SignalK/signalk-server/pull/2568"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-17T03:45:13.242886439Z"}}