CVE-2026-41893
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.
INFO
Published Date :
May 9, 2026, 8:16 p.m.
Last Modified :
May 15, 2026, 7:14 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Signal K Server to version 2.25.0.
- Ensure rate limiting is configured appropriately.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-41893.
| URL | Resource |
|---|---|
| https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d | Patch |
| https://github.com/SignalK/signalk-server/pull/2568 | Issue Tracking Patch |
| https://github.com/SignalK/signalk-server/releases/tag/v2.25.0 | Product Release Notes |
| https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g | Exploit Mitigation Vendor Advisory |
| https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-41893 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-41893
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-41893 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-41893 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 15, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Added CPE Configuration OR *cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:* versions up to (excluding) 2.25.0 Added Reference Type GitHub, Inc.: https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d Types: Patch Added Reference Type GitHub, Inc.: https://github.com/SignalK/signalk-server/pull/2568 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/SignalK/signalk-server/releases/tag/v2.25.0 Types: Product, Release Notes Added Reference Type CISA-ADP: https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g Types: Exploit, Mitigation, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g Types: Exploit, Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 14, 2026
Action Type Old Value New Value Added Reference https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g -
New CVE Received by [email protected]
May. 09, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CWE CWE-307 Added Reference https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d Added Reference https://github.com/SignalK/signalk-server/pull/2568 Added Reference https://github.com/SignalK/signalk-server/releases/tag/v2.25.0 Added Reference https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g