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CriticalVulnerabilityCVE-2026-118690updated 28 Oct 2026, 22:18 UTC

Signal K Server leaks admin keys via log download, enabling full takeover

Anyone on the internet can download the server's log files without logging in. Those files contain a secret key that lets an attacker pretend to be an administrator and take full control of the server.

Fixed in Signal K Server 2.33.0 or laterOfficial source
SeverityCriticalCVSS 9.3 of 10
Being exploited?UnclearNo reports either way yet
Fix available?YesSignal K Server 2.33.0 or later · since 28 Oct 2026
How sure is this?Official sourceBacked by an official source

How the attack works simplified

  1. 1Remote attackerNo login or account needed
  2. 2Request logsCalls /skServer/ziplogs endpoint
  3. 3Extract secret keysecurity.json in ZIP holds JWT key
  4. 4Forge admin tokenSigns tokens with stolen secret
  5. 5Create admin accountPersistent access to server
  6. ResultAttacker gains full admin control

What happened

Signal K Server versions before 2.33.0 expose the /skServer/ziplogs endpoint without authentication; the downloaded ZIP includes security.json, which contains the JWT secretKey used to sign admin tokens.

Why it is dangerous: An attacker can forge administrator tokens and create lasting admin accounts, gaining full control of the server and any boat, vessel, or system data it manages. Anyone running an exposed Signal K Server is at risk.

Are you affected?

You are affected if you run Signal K Server earlier than 2.33.0 and its web interface or port is reachable from the internet or an untrusted network.

Signal K Server versions before 2.33.0

What to do

  1. Update Signal K Server to version 2.33.0 or later
  2. Restrict network access to the server so it is not exposed to the internet
  3. Review admin accounts and rotate the JWT secret key after patching if the server was exposed
  4. Check logs for unexpected requests to /skServer/ziplogs

Timeline

  1. 28 Oct 2026, 22:17 UTC
    Publicly disclosed
  2. 28 Oct 2026, 22:17 UTC
    Reported by NVD · NVD
  3. 28 Oct 2026, 22:18 UTC
    Picked up by Zero Radar

Sources 1 report, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-118690
CVSS
9.3 / 10
Disclosed
28 Oct 2026, 22:17 UTC
On Zero Radar
28 Oct 2026, 22:18 UTC (2 min after disclosure)
Last change
28 Oct 2026, 22:18 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Signal K Server leaks admin keys via log download, enabling full takeover · Zero Radar