{"id":"CVE-2026-41893","state":"PUBLISHED","title":"Signal K Server's WebSocket Login Endpoint Lacks Rate Limiting (Credential Brute-Force)","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.","publishedAt":"2026-05-09T19:12:10.082Z","updatedAt":"2026-05-14T17:50:55.289Z","severity":{"score":8.7,"label":"High","version":"4.0","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","source":"GitHub_M"},"assigner":"GitHub_M","products":["SignalK signalk-server"],"affected":[{"vendor":"SignalK","product":"signalk-server","versions":[{"version":"< 2.25.0","status":"affected"}]}],"references":["https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g","https://github.com/SignalK/signalk-server/pull/2568","https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d","https://github.com/SignalK/signalk-server/releases/tag/v2.25.0"],"weaknesses":["CWE-307"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/41xxx/CVE-2026-41893.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-41893","state":"PUBLISHED","datePublished":"2026-05-09T19:12:10.082Z","dateUpdated":"2026-05-14T17:50:55.289Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-22T15:11:54.671Z"},"containers":{"cna":{"title":"Signal K Server's WebSocket Login Endpoint Lacks Rate Limiting (Credential Brute-Force)","descriptions":[{"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."}],"affected":[{"vendor":"SignalK","product":"signalk-server","versions":[{"version":"< 2.25.0","status":"affected"}]}],"references":[{"url":"https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g","name":"https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/SignalK/signalk-server/pull/2568","name":"https://github.com/SignalK/signalk-server/pull/2568","tags":["x_refsource_MISC"]},{"url":"https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d","name":"https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d","tags":["x_refsource_MISC"]},{"url":"https://github.com/SignalK/signalk-server/releases/tag/v2.25.0","name":"https://github.com/SignalK/signalk-server/releases/tag/v2.25.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH","vectorString":"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-307","lang":"en","description":"CWE-307: Improper Restriction of Excessive Authentication Attempts","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-09T19:12:10.082Z"},"source":{"advisory":"GHSA-vmfm-ch9h-5c7g","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-14T17:50:07.187900Z","id":"CVE-2026-41893","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-14T17:50:55.289Z"}}]}}}