CVE-2025-66398
9.6
CRITICAL · CVSS 3.1 · EPSS 19.9% (pctl 97)
Patch early
EPSS 19.9% — above the 10% action threshold.
Description
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.
Scoring
| CVSS | 9.6 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H |
| EPSS | 19.85% — more likely to be exploited than 97% of all CVEs |
| Weakness | CWE-78 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2026-01-01 |
| Last modified | 2026-10-01 |
Affected (1)
| Vendor | Product |
|---|---|
| signalk | signal k server |
References
→ the Explorer · watch your stack · NVD