Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-81855

CVE-2026-81855CRITICAL

Wärtsilä FOS-Onboard Use of Hard-coded Cryptographic Key

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   N   H   H   N    9.3   .0059   46.3     —

AFFECTED
  Product      Versions        Fixed
  FOS-Onboard  5.07.0923.01 –  5.08.4052.01

TIMELINE
  Sep 8   Reserved by icscert
  Sep 15  Published (CNA: icscert)
  Sep 24  PATCH SHIPPED — CVE-2026-81855 (Wärtsilä FOS-Onboard). Fixed in FOS-Onboard 5.08.4052.01.

CWE-321 · CNA: icscert · CVSS v4.0 · 4 references · NVD status: Deferred

Description

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

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 8, 2026	Reserved	Reserved by icscert
September 15, 2026	Published	Published (CNA: icscert)
September 24, 2026	PATCH SHIPPED	PATCH SHIPPED — CVE-2026-81855 (Wärtsilä FOS-Onboard). Fixed in FOS-Onboard 5.08.4052.01.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Wärtsilä	FOS-Onboard	—	5.07.0923.01	5.08.4052.01

Weaknesses

CWE-321

References (4)

Authoritative record: CVE-2026-81855 at cve.org

Vendors: wärtsilä

Weaknesses: CWE-321

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-81855 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.