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No exploitation reportedFix availableAwaiting NVD analysis

CVE-2026-123807

Signal K Server: Unauthenticated path traversal in resources-provider v2 API leads to JWT secret disclosure, admin impersonation and remote code execution

No exploitation reported by the sources we read.

  • Published2026-11-09
  • Fixed in1.5.3
  • WeaknessCWE-22

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Signal K Server is a server application that runs on a central hub in a boat. From 2.0.0 until 2.34.0 for Signal K Server and from 1.0.0 until 1.5.3 for @signalk/resources-provider, the v2 REST route GET /signalk/v2/api/resources/:resourceType/:resourceId accepts an unsafe resourceId that can escape the intended resource directory. The route passes the attacker-controlled resourceId through src/api/resources/index.ts to FileStore.getResource() in packages/resources-provider-plugin/src/filestorage.ts without adequate path containment, allowing arbitrary JSON files reachable by the server to be read. Related PUT and DELETE resource operations can write or delete files outside the storage root. Deployments with allow_readonly enabled permit anonymous reads, while other deployments require a readonly user token. Reading security.json exposes the HS256 JWT signing secret and password hashes, allowing an attacker to forge an administrator token. Administrative access to POST /skServer/providers can then create an Execute provider that runs commands with the server process privileges and persists its configuration across restarts. This issue is fixed in Signal K Server 2.34.0 and @signalk/resources-provider 1.5.3.

Timeline

dates in UTC
  1. 2026-11-0920:39CVE publishedCNA

Versions per branch

OSV
@signalk/resources-provider
BranchAffectedFixed in
1.x≥ 1.0.0, < 1.5.31.5.3
signalk-server
BranchAffectedFixed in
2.x≥ 2.0.0, < 2.34.02.34.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA2 products

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • signalk-server
    Affected
    • = >= 2.0.0, < 2.34.0no fix stated
  • @signalk resources-provider
    Affected
    • = >= 1.0.0, < 1.5.3no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-09

Fix

  1. Update @signalk/resources-provider to 1.5.3

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE record2026-11-09
  • CNACVSS 3.19.82026-11-09
  • CNAweakness (CWE)CWE-222026-11-09
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryCRITICAL2026-10-30

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-11-09
GitHub Advisory
GHSA-4xm8-rg9h-jhq2

Frequently asked questions

What is CVE-2026-123807?

Signal K Server is a server application that runs on a central hub in a boat. From 2.0.0 until 2.34.0 for Signal K Server and from 1.0.0 until 1.5.3 for @signalk/resources-provider, the v2 REST route GET /signalk/v2/api/resources/:resourceType/:resourceId accepts an unsafe resourceId that can escape the intended resource directory. The route passes the attacker-controlled resourceId through src/api/resources/index.ts to FileStore.getResource() in packages/resources-provider-plugin/src/filestorage.ts without adequate path containment, allowing arbitrary JSON files reachable by the server to be read. Related PUT and DELETE resource operations can write or delete files outside the storage root. Deployments with allow_readonly enabled permit anonymous reads, while other deployments require a readonly user token. Reading security.json exposes the HS256 JWT signing secret and password hashes, allowing an attacker to forge an administrator token. Administrative access to POST /skServer/providers can then create an Execute provider that runs commands with the server process privileges and persists its configuration across restarts. This issue is fixed in Signal K Server 2.34.0 and @signalk/resources-provider 1.5.3.

Is CVE-2026-123807 actively exploited?

Active exploitation of CVE-2026-123807 has not been confirmed.

What is the CVSS score for CVE-2026-123807?

CVE-2026-123807 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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