CVE-2026-81855 in FOS-Onboard
Summary
by MITRE • 09/16/2026
A hardcoded cryptographic client authentication key vulnerability exists in the robot testing framework component of Wärtsilä FOS-Onboard.
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Analysis
by VulDB Data Team • 09/16/2026
The discovery of a hardcoded cryptographic client authentication key within the robot testing framework of Wärtsilä FOS-Onboard represents a critical failure in secure software development practices, specifically falling under CWE-798: Use of Hard-coded Credentials. This vulnerability stems from the inclusion of static secret material directly into the application source code or binary artifacts rather than deriving them dynamically through a secure key management system. In the context of industrial control systems and marine automation platforms like FOS-Onboard, such oversights can have severe consequences because they undermine the fundamental principle that authentication secrets must remain confidential to authorized entities only. The robot testing framework is likely used for automated validation of robotic components or simulation environments during development or maintenance phases, but if this component retains a static key in production builds or accessible artifacts, it creates an immediate and exploitable attack vector.
From a technical perspective, the presence of a hardcoded key means that any individual with access to the software binary, configuration files, or source code repository can extract the credential without needing to bypass complex encryption schemes or reverse-engineer dynamic generation logic. This aligns closely with ATT&CK technique T1552: Unsecured Credentials, where attackers seek out stored credentials on a system for lateral movement or privilege escalation. If an attacker gains even limited access to the network segment hosting FOS-Onboard components, they can utilize this static key to authenticate as a legitimate client within the testing framework. This bypasses standard authentication controls and allows the adversary to interact with the robot testing infrastructure as if they were an authorized administrator or developer tool.
The operational impact of this vulnerability is significant due to the nature of industrial robotics and automation systems. An attacker leveraging this hardcoded key could potentially manipulate test parameters, inject malicious commands into robotic control loops, or exfiltrate sensitive data processed by the framework. In a marine environment, where safety and reliability are paramount, unauthorized access to testing frameworks can lead to compromised integrity checks on critical navigation or propulsion systems. Furthermore, because the key is static, it cannot be rotated easily without deploying new software versions, meaning that once exposed, the vulnerability persists indefinitely unless remediated through code changes. This also facilitates persistent threats where an attacker maintains long-term access by reusing the same credential across multiple sessions and potentially different instances of the system if the same hardcoded value is reused globally.
Mitigation strategies must focus on immediate isolation followed by architectural correction. Initially, network segmentation should be enforced to restrict access to the robot testing framework components to only those systems that absolutely require it, reducing the attack surface available for exploitation. The hardcoded key must be immediately revoked and replaced with a dynamic authentication mechanism such as OAuth2, mutual TLS, or integration with an enterprise identity provider like Active Directory or LDAP. Developers should adopt secure coding standards that mandate the use of environment variables, hardware security modules, or dedicated secret management services to handle cryptographic keys. Regular automated scanning for hardcoded secrets in source code repositories and build artifacts is essential to prevent recurrence. Additionally, implementing strict access controls and audit logging within the testing framework will help detect any unauthorized usage attempts resulting from this vulnerability before they lead to broader system compromise.