How should we interpret CVSS severity scores?

CVSS estimates technical severity, but it does not automatically equal business risk. Prioritize using context like internet exposure, asset criticality, known exploitation, and whether compensating controls exist. A Medium CVSS on an exposed production system can be more urgent than a Critical on an isolated non-production host.

Vulnerability Database

Q: What is a Vulnerability (CVE) and why does it matter?

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

Q: What's the difference between a vulnerability, an exploit, and a zero-day?

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. Risk increases sharply when exploitation becomes reliable or widespread.

Q: Why do vulnerabilities keep reappearing in our environment?

Recurring findings usually come from incomplete asset discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host.

Q: How do we prioritize remediation without burning out the team?

Use a repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress so remediation is steady, not reactive.

Q: How can SynScan help reduce vulnerability risk over time?

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.

417,502

Total vulnerabilities in the database

Signal K Server: Buffered logs exposed to unauthenticated WebSocket clients — signalk-server

Missing Authentication for Critical Function

Summary

An unauthenticated WebSocket client can subscribe to the log path and receive buffered server logs.

WebSocket connections are intentionally permitted before authentication because login occurs over the WebSocket connection. However, the log subscription path does not enforce an authorization check.

processSubscribe handles subscriptions to the log path separately, without applying access control:

if (
  Array.isArray(msg.subscribe) &amp;&amp;
  msg.subscribe.length &gt; 0 &amp;&amp;
  msg.subscribe[0].path === &#039;log&#039;
) {
  if (!spark.logUnsubscribe) {
    spark.logUnsubscribe = startServerLog(app, spark)
  }
} else {
  // normal subscriptions go through subscriptionmanager, which applies
  // securityStrategy.filterReadDelta
}

startServerLog then replays the whole buffer to that socket:

app.logging.getLog().forEach((log) =&gt; {
  spark.write({ type: &#039;LOG&#039;, data: log })
})

The asymmetry is inside this one file. Writes are gated by securityStrategy.shouldAllowWrite (ws.ts:961), normal delta subscriptions are filtered by securityStrategy.filterReadDelta (ws.ts:1159, the else branch of this same function), and the log branch consults neither.

An unauthenticated socket, which is legitimately open for login, can subscribe to log and receive buffered server logs.

Fix: Requires an administrator principal, before startServerLog, in the same way the other branch defers to securityStrategy. The fix was released with version 2.31.0-beta.1.

The investigated code path was reviewed at commit 26ab199. No server was run and no WebSocket frames were captured. AI assistance was used during the investigation.

Published: Nov 12, 2026
Updated: Nov 13, 2026
GHSA: GHSA-7m8x-x364-m26j
Severity: Medium
Exploit:
CISA KEV:

CVSS v3:

Severity: Medium
Score: 5.3
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CWEs:

CWE-306

Affected Software
References

Software	Affected versions
signalk-server	`< 2.31.0-beta.1`

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Frequently Asked Questions

What is a Vulnerability (CVE) and why does it matter?

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.