CVE-2026-95751 in Fabric Composer
Summary
by MITRE • 11/03/2026
An improper certificate validation vulnerability in the API of HPE Networking Fabric Composer could allow an unauthenticated remote attacker to circumvent existing authentication controls if certain preconditions outside of the attacker's control are met. Successful exploitation could allow an attacker to gain unauthorized access to the affected system.
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Analysis
by VulDB Data Team • 11/03/2026
The identified vulnerability represents a critical failure in the transport layer security implementation within the application programming interface of HPE Networking Fabric Composer. This flaw is categorized as an improper certificate validation issue, which fundamentally undermines the integrity and authenticity guarantees provided by Secure Sockets Layer or Transport Layer Security protocols. In standard secure communications, client applications must rigorously verify that the server's digital certificate is issued by a trusted Certificate Authority, has not expired, matches the hostname of the target system, and possesses valid cryptographic signatures. The absence of these checks allows an attacker to bypass the expected security boundaries established during the initial handshake phase of communication.
From a technical perspective, this vulnerability enables what is commonly known as a man-in-the-middle attack scenario where the client accepts any certificate presented by the server without validation. This means that if an attacker can position themselves between the legitimate user or management station and the HPE Networking Fabric Composer system, they can present a self-signed or forged certificate. Because the API does not validate this certificate against a trusted root store or check for hostname consistency, the client will establish an encrypted session with the malicious actor instead of the intended service provider. This effectively neutralizes encryption as a protective measure since the attacker holds the private key corresponding to the accepted public certificate and can decrypt all traffic passing through their position.
The operational impact of this vulnerability is severe due to its potential for unauthenticated remote access. Although the description notes that certain preconditions outside the attacker's control must be met, these typically involve network-level positioning or specific configuration states on the target system that may already exist in many enterprise environments. Once exploitation occurs, an attacker can intercept sensitive management traffic, steal session tokens, credentials, or configuration data transmitted over the API. Furthermore, by impersonating the Fabric Composer service to downstream clients or integrating systems, the attacker could inject malicious commands into network automation workflows, leading to unauthorized changes in network topology, policy enforcement rules, and device configurations across the entire managed infrastructure.
This vulnerability aligns with CWE-295 Improper Certificate Validation from the Common Weakness Enumeration standard. It also maps directly to MITRE ATT&CK technique T1078 Valid Accounts if the attacker uses stolen credentials obtained via interception, or more accurately to techniques involving credential access and lateral movement through compromised management interfaces such as T1496 Remote Service Discovery combined with T1552 Unsecured Credentials if sensitive data is exfiltrated. The core attack vector relates to MITRE ATT&CK tactic TA0001 Initial Access by exploiting trust relationships, specifically leveraging the failure of identity verification mechanisms that are foundational to secure API communications in enterprise networking environments.
Mitigation strategies must focus on enforcing strict certificate validation policies within the client-side implementation of the Fabric Composer API integration tools. Administrators should ensure that all software components interacting with this API perform full chain-of-trust validation, including checking for expiration dates, verifying hostname matches against Subject Alternative Names, and validating signatures against known trusted root certificates. Where possible, mutual TLS authentication should be implemented to require both server and client certificate verification. Additionally, organizations should monitor network traffic for anomalies indicative of man-in-the-middle attacks and ensure that management interfaces are isolated within secure administrative networks with strict access control lists to limit exposure to potential attackers who might attempt to exploit this validation flaw.