Auth bypass in Signalk Signalk-Server
CVE-2026-118690
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.
Vulnerability class: Broken Authentication
Published .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/SignalK/signalk-server/commit/728bab82742d16c54e50525b95dc9b6e323961… (patch)
- github.com/SignalK/signalk-server (product)
- github.com/SignalK/signalk-server/security/advisories/GHSA-4w32-qx5g-cpwv (vendor-advisory)
- github.com/SignalK/signalk-server/blob/v2.32.0/src/interfaces/logfiles.js (technical-description)
- github.com/SignalK/signalk-server/releases/tag/v2.33.0 (release-notes)
- www.vulncheck.com/advisories/signal-k-server-before-2.33.0-missing-authenticati… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-118690?
- CVE-2026-118690 is a critical-severity vulnerability in Signalk Signalk-Server, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-10-28.
- How severe is CVE-2026-118690?
- Critical severity. CVSS v3 base score is 9.8 out of 10.