What is CVE-2026-81855?

CVE-2026-81855 is a critical-severity vulnerability, classified under Use of Hard-coded Cryptographic Key. CVSS score: 9.1/10. Published 2026-09-15.

How severe is CVE-2026-81855?

Critical severity. CVSS v3 base score is 9.1 out of 10.

CVE-2026-81855

CVE-2026-81855

A hardcoded cryptographic client authentication key vulnerability exists in the robot testing framework component of Wärtsilä FOS-Onboard.

Published 2026-09-15 · last modified 2026-09-24.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.006 (48.2th percentile), scored 2026-10-31.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Weakness classification (CWE)

CWE-321 — Use of Hard-coded Cryptographic Key

References

Frequently asked questions

What is CVE-2026-81855?: CVE-2026-81855 is a critical-severity vulnerability, classified under Use of Hard-coded Cryptographic Key. CVSS score: 9.1/10. Published 2026-09-15.
How severe is CVE-2026-81855?: Critical severity. CVSS v3 base score is 9.1 out of 10.