Privileged-client impersonation via hard-coded authentication key
Published Sep 15, 2026 · Updated Sep 15, 2026
Use of a hard-coded cryptographic key in Wärtsilä FOS-Onboard 5.07.0923.01 allows remote attackers to impersonate a privileged client. The robot testing framework embeds the client-authentication key in the affected build, so possession of the shared secret is not tied to an authorized client. Network access to a deployment outside the vendor-recommended configuration is required; the disclosed impact is credential theft and privileged-client impersonation.
Summary
What happened
Use of a hard-coded cryptographic key in Wärtsilä FOS-Onboard 5.07.0923.01 allows remote attackers to impersonate a privileged client. The robot testing framework embeds the client-authentication key in the affected build, so possession of the shared secret is not tied to an authorized client. Network access to a deployment outside the vendor-recommended configuration is required; the disclosed impact is credential theft and privileged-client impersonation.
The record
- CVE
- CVE-2026-81855
- Published
- Sep 15, 2026
- Updated
- Sep 15, 2026
- Vendor
- Wärtsilä
- Product
- FOS-Onboard
- Classifications
- CWE-321, T1078
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 15, 2026CVE publishedPublication date reported by the CVE source.
- Sep 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=5.07.0923.01
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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