Signal K Server Vulnerable to Access Request Spoofing

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

EPSS

• CVE-2025-69203: 0.30% estimated exploitation activity in the next 30 days; percentile 23.11 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

The SignalK access request system has two related features that when combined by themselves and with the infromation disclosure vulnerability enable convincing social engineering attacks against administrators. When a device creates an access request, it specifies three fields: clientId, description, and permissions. The SignalK admin UI displays the description field prominently to the administrator when showing pending requests, but the actual permissions field (which determines the access level granted) is less visible or displayed separately. This allows an attacker to request admin permissions while providing a description that suggests readonly access. The access request handler trusts the X-Forwarded-For HTTP header without validation to determine the client's IP address. This header is intended to preserve the original client IP when requests pass through reverse proxies, but when trusted unconditionally, it allows attackers to spoof their IP address. The spoofed IP is…

Published by the source

2 Jan 2026, 15:26 UTC

Last modified by the source

3 Feb 2026, 03:14 UTC

Source last checked

26 Oct 2026, 12:41 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-vfrf-vcj7-wvr8

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-vfrf-vcj7-wvr8

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# Patch Next advisory brief: CVE-2025-69203

Advisory: Signal K Server Vulnerable to Access Request Spoofing
IDs: CVE-2025-69203, GHSA-vfrf-vcj7-wvr8
Record: https://patchnext.com/advisories/cve-2025-69203 (revision 2, source checked 26 Oct 2026, 12:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: signalk-server 2.19.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm signalk-server: affected < 2.19.0; fixed in 2.19.0

## Suggested inspection (read-only)
- `npm ls signalk-server --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on signalk-server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-vfrf-vcj7-wvr8 (OSV record GHSA-vfrf-vcj7-wvr8 lists affected ranges: npm signalk-server >=0 <2.19.0 (fixed))
- Verified: https://github.com/advisories/GHSA-vfrf-vcj7-wvr8 (GitHub-reviewed advisory GHSA-vfrf-vcj7-wvr8 lists affected ranges: npm signalk-server >=0 <2.19.0)

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