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TI-2026-82216 Aliases CVE-2026-118690GHSA-4r6j-f6gv-fqcx

Missing authentication in Signal K Server exposes log archives

Priority MEDIUM 49CWE-306Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

Signal K Server before 2.33.0 contains a missing authentication flaw that lets unauthenticated remote attackers download log archives through the /skServer/ziplogs endpoint. The archive includes security.json, so an attacker can extract the JWT secretKey, forge administrator tokens and create persistent admin accounts for full control of the server.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00688 52nd percentileScored 2026-11-07
Fix Fixed signalk-server (SignalK): 2.33.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SignalKsignalk-serverbefore 2.33.02.33.0Patch availableCNA
  • signalk-server VendorSignalK Affected before 2.33.0 Fixed in 2.33.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:*——SignalK
  • cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:* Versions — — ·SignalK

Remediation

Upgrade signalk-server to version 2.33.0 or later, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA signalk-server (SignalK) Fixed in 2.33.0

Timeline

  1. 2026-10-28 Threatist record created from CVE-2026-118690
  2. 2026-10-29 Alias added: GHSA-4r6j-f6gv-fqcx
  3. 2026-10-29 CISA SSVC decision points changed

References

Patch 1

Advisory 1

Other 3

  • TI-2026-26300 signalk-server: Privilege Escalation by Admin Role Injection via /enableSecurity CVSS 3.1CRITICAL 9.4
  • TI-2025-40835 Signal K Server has Unauthenticated State Pollution leading to Remote Code Execution (RCE) CVSS 3.1CRITICAL 9.7
  • TI-2025-42138 Signal K Server vulnerable to JWT Token Theft via WebSocket Enumeration and Unauthenticated Polling CVSS 3.1CRITICAL 9.1
  • TI-2026-30295 Signal K Server's WebSocket Login Endpoint Lacks Rate Limiting (Credential Brute-Force) CVSS 4.0HIGH 8.7
  • TI-2025-42657 Signal K Server Vulnerable to Access Request Spoofing CVSS 3.1HIGH 8.8
  • TI-2026-18939 RCE - Command Injection in Signal K set-system-time plugin CVSS 3.1CRITICAL 10.0
See all 16 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences