CVE-2026-33951 json
signalk-server: Unauthenticated Source Priorities Manipulation
published 2026-04-02 7 mo ago modified 2026-07-24 3 mo ago also GHSA-gfmv-vh34-h2x5 , EUVD-2026-18374
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 25%
- public exploits
- 0
- none known
Summary
Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.24.0-beta.1, the SignalK Server exposes an unauthenticated HTTP endpoint that allows remote attackers to modify navigation data source priorities. This endpoint, accessible via PUT /signalk/v1/api/sourcePriorities, does not enforce authentication or authorization checks and directly assigns user-controlled input to the server configuration. As a result, attackers can influence which GPS, AIS, or other sensor data sources are trusted by the system. The changes are immediately applied and persisted to disk, allowing the manipulation to survive server restarts. This issue has been patched in version 2.24.0-beta.1.
Patch / fix
- npm signalk-server 2.24.0-beta.1
- signalk signal_k_server 2.24.0
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N |
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | signalk-server | <2.24.0-beta.1 |
2.24.0-beta.1 |
Affected products
- SignalK signalk-server
Classification
References
-
github.com
/SignalK/signalk-server/security/advisories/GHSA-gfmv-vh34-h2x5
web, vendor-advisory
-
github.com
/SignalK/signalk-server/releases/tag/v2.24.0-beta.1
web, product, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-33951
advisory
-
github.com
/SignalK/signalk-server
package
Sources
- CVE List CVE-2026-33951
- GitHub Advisory GHSA-gfmv-vh34-h2x5
- NVD CVE-2026-33951
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