CVE-2026-41893

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS — Exploit Prediction

0.0004

Probability of exploitation

0.11%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-307 CWE-307

Affected Products

Vendor	Product	Versions
signalk	signal_k_server	< 2.25.0

References

Advisories & Patches

https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d https://github.com/SignalK/signalk-server/pull/2568 https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g

Exploits

https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g

Other References

https://github.com/SignalK/signalk-server/releases/tag/v2.25.0

Frequently Asked Questions

What is CVE-2026-41893? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-41893? +

CVE-2026-41893 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0004, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-41893? +

CVE-2026-41893 affects products from signalk, specifically: signal_k_server. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-41893? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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