CVE-2025-66398

9.6 CRITICAL 20% exploit odds Fix listed Injection Library

What it is

Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.19.0, an unauthenticated attacker can pollute the internal state (`restoreFilePath`) of the server via the `/skServer/validateBackup` endpoint. This allows the attacker to hijack the administrator's "Restore" functionality to overwrite critical server configuration files (e.g., `security.json`, `package.json`), leading to account takeover and Remote Code Execution (RCE). Version 2.19.0 patches this vulnerability.

At a glance

Exploitability: Can be exploited over the network without logging in, but needs a user to act. High risk of data exposure, data tampering, service disruption.
Exploit odds: 19.9% chance of exploitation in the next 30 days (EPSS). Higher than most.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2025-11-28 23:33 UTC ReservedThe CVE id was reserved by its CNA
2026-01-01 18:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-07 11:10 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 19.9% in the next 30 days (EPSS).
Severity: 9.6 CRITICAL (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2026-01-01 18:15 UTC
Last modified: 2026-10-07 11:10 UTC
Exploit probability: 19.9% · EPSS, next 30 days
Weakness: CWE-78 · OS command injection
Record status: Analyzed

Affected

Signalk Signal K Server < 2.19.0

Attack profile CVSS 3.1 · 9.6

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required
Scope: Changed
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record