---
id: CVE-2026-118690
title: Signal K Server before 2.33.0 Missing Authentication via /skServer/ziplogs
summary: >-
  Signal K Server before 2.33.0 contains a missing authentication vulnerability
  that allows unauthenticated remote attackers to download log archives via the
  /skServer/ziplogs endpoint. Attackers can extract the JWT secretKey from
  security…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-306
vendor: SignalK
product: signalk-server
affected:
  - signalk-server < 2.33.0
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-29T15:48:44.982534Z'
published: '2026-10-28'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T17:22:34.003Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-118690'
references:
  - url: >-
      https://github.com/SignalK/signalk-server/commit/728bab82742d16c54e50525b95dc9b6e32396107
    label: Patch Commit
  - url: 'https://github.com/SignalK/signalk-server'
  - url: >-
      https://github.com/SignalK/signalk-server/security/advisories/GHSA-4w32-qx5g-cpwv
    label: GitHub Security Advisory (GHSA-4w32-qx5g-cpwv)
  - url: >-
      https://github.com/SignalK/signalk-server/blob/v2.32.0/src/interfaces/logfiles.js#L30-L91
  - url: 'https://github.com/SignalK/signalk-server/releases/tag/v2.33.0'
    label: signalk-server v2.33.0 Release Notes
  - url: >-
      https://www.vulncheck.com/advisories/signal-k-server-before-2.33.0-missing-authentication-via-skserver-ziplogs
    label: >-
      VulnCheck Advisory: Signal K Server before 2.33.0 Missing Authentication
      via /skServer/ziplogs
tags:
  - cve.org
epss: 0.00688
epssPercentile: 0.52817
ingestedAt: '2026-11-01T22:02:40.997Z'
---

## Overview

Signal K Server before 2.33.0 contains a missing authentication vulnerability that allows unauthenticated remote attackers to download log archives via the /skServer/ziplogs endpoint. Attackers can extract the JWT secretKey from security.json in the ZIP, forge administrator tokens, and create persistent admin accounts for full server control.

## Affected

- `signalk-server < 2.33.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.