CVE-2026-81855

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-16. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
56(Track)
EG Risk 56/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
41%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
Patch available. Sources: cisa.
generic

Wärtsilä ICS patch deployment

https://www.wartsila.com/services-catalogue/engine-services-4-stroke/wartsila-ics-patch-deployment#contact
cisa Patch Available

Wärtsilä FOS-Onboard | CISA

https://www.cisa.gov/news-events/ics-advisories/icsa-26-258-02

Vendor Advisories for CVE-2026-81855(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 36× in last 7d / 36× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 15:37 UTCGHSA enrichment
  2. 2026-09-19 11:37 UTCGHSA enrichment
  3. 2026-09-19 07:37 UTCGHSA enrichment
  4. 2026-09-19 03:40 UTCGHSA enrichment
  5. 2026-09-18 23:44 UTCGHSA enrichment
  6. 2026-09-18 19:48 UTCGHSA enrichment
  7. 2026-09-18 19:31 UTCEG score recompute
  8. 2026-09-18 19:31 UTCGHSA enrichment
  9. 2026-09-18 19:28 UTCEPSS rescore
  10. 2026-09-18 15:33 UTCGHSA enrichment
  11. 2026-09-18 11:35 UTCGHSA enrichment
  12. 2026-09-18 07:37 UTCGHSA enrichment
  13. 2026-09-18 03:41 UTCGHSA enrichment
  14. 2026-09-17 23:45 UTCEG score recompute
  15. 2026-09-17 23:45 UTCGHSA enrichment
  16. 2026-09-17 19:13 UTCGHSA enrichment
  17. 2026-09-17 15:06 UTCGHSA enrichment
  18. 2026-09-17 11:10 UTCGHSA enrichment
  19. 2026-09-17 07:15 UTCGHSA enrichment
  20. 2026-09-17 03:17 UTCGHSA enrichment
  21. 2026-09-16 23:21 UTCGHSA enrichment
  22. 2026-09-16 19:25 UTCEG score recompute
  23. 2026-09-16 19:25 UTCGHSA enrichment
  24. 2026-09-16 18:26 UTCEG score recompute
  25. 2026-09-16 18:26 UTCGHSA enrichment
Show 11 more
  1. 2026-09-16 17:57 UTCEG score recompute
  2. 2026-09-16 17:57 UTCGHSA enrichment
  3. 2026-09-16 14:08 UTCEPSS rescore
  4. 2026-09-16 14:02 UTCGHSA enrichment
  5. 2026-09-16 10:06 UTCGHSA enrichment
  6. 2026-09-16 06:11 UTCGHSA enrichment
  7. 2026-09-16 02:16 UTCEG score recompute
  8. 2026-09-16 02:16 UTCGHSA enrichment
  9. 2026-09-15 22:20 UTCEG score recompute
  10. 2026-09-15 21:33 UTCEG score recompute
  11. 2026-09-15 21:32 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-81855?
CVE-2026-81855 is a critical vulnerability published on September 15, 2026. A hardcoded cryptographic client authentication key vulnerability exists in the robot testing framework component of Wärtsilä FOS-Onboard.
When was CVE-2026-81855 disclosed?
CVE-2026-81855 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81855 actively exploited?
CVE-2026-81855 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 59.1% of all scored CVEs.
What is the CVSS score of CVE-2026-81855?
CVE-2026-81855 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-81855?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81855, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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