CVE-2026-73738 in Fabric Composer
Summary
by MITRE • 09/01/2026
A vulnerability in the underlying operating system of HPE Networking Fabric Composer could allow an authenticated low privilege operator user with local access to view sensitive information. Successful exploitation could allow an attacker to retrieve information which could be used to potentially gain further privileges on the affected system.
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Analysis
by VulDB Data Team • 09/02/2026
The identified security flaw resides within the core operating system components of HPE Networking Fabric Composer, specifically affecting users who possess authenticated low-privilege operator status and local access capabilities. This vulnerability is classified as an information disclosure issue where the application fails to properly enforce access controls on specific sensitive data files or memory regions. Consequently, a user with minimal privileges can bypass intended restrictions to read confidential system information that should be restricted to higher-level administrative accounts. The root cause typically stems from improper permission settings on configuration files, log directories, or internal API endpoints that expose credentials, network topology details, or cryptographic keys without adequate validation of the caller's privilege level.
From a technical perspective, this flaw aligns with CWE-200, which defines exposure of sensitive information to an unauthorized actor. The vulnerability allows for the retrieval of data such as password hashes, session tokens, private SSL/TLS certificates, or internal network configuration maps that are critical for maintaining the integrity and confidentiality of the fabric management infrastructure. By leveraging this weakness, an attacker can extract these artifacts locally without needing to exploit a remote code execution vector or bypass complex authentication mechanisms. The simplicity of local access makes this particularly dangerous in environments where physical security might be compromised or when insider threats exist within lower-tier operational roles.
The operational impact of exploiting this vulnerability extends beyond simple data leakage and serves as a critical stepping stone for privilege escalation attacks. An attacker who successfully retrieves sensitive information can use the obtained credentials or cryptographic material to authenticate as higher-privileged users, thereby gaining control over network configurations and management interfaces. This capability directly supports ATT&CK technique T1078, Valid Accounts, by allowing the adversary to leverage stolen legitimate credentials to move laterally within the environment. Furthermore, access to internal topology data facilitates reconnaissance activities described in ATT&CK tactic TA0043, Reconnaissance, enabling the attacker to map out critical infrastructure components and identify high-value targets for subsequent exploitation attempts against more secure systems connected to the fabric.
To mitigate this risk, administrators must ensure that all software packages related to HPE Networking Fabric Composer are updated to the latest version provided by the vendor, which includes patches addressing these permission misconfigurations. It is also essential to enforce strict principle of least privilege across all user accounts, ensuring that operator-level users do not require local shell access unless absolutely necessary for their specific duties. Implementing robust file system permissions and auditing mechanisms can help detect unauthorized attempts to read sensitive directories. Additionally, organizations should consider deploying endpoint detection and response solutions capable of monitoring unusual file access patterns by low-privilege processes, thereby providing an additional layer of defense against information disclosure attacks that could lead to broader compromise of the network infrastructure.