CVE-2026-41893

HIGH EPSS 24.4%
Published May 9, 20261mo ago · Modified Jun 17, 20262w ago
8.7 CVSS 4.0
High
Find Similar
Published May 9, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
8.7
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
24.4% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-307

Affected Products 1

VendorProductVersionRange
signalksignal_k_server* <2.25.0

References 4

  • github.com https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d
    Patch
  • github.com https://github.com/SignalK/signalk-server/pull/2568
    Issue TrackingPatch
  • github.com https://github.com/SignalK/signalk-server/releases/tag/v2.25.0
    ProductRelease Notes
  • github.com https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g
    ExploitMitigationVendor Advisory

Remediation

  • github.com https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d
    Patch
  • github.com https://github.com/SignalK/signalk-server/pull/2568
    Issue TrackingPatch