CVE-2026-95735 in Fabric Composer
Summary
by MITRE • 11/03/2026
An improper certificate validation vulnerability exists in HPE Networking Fabric Composer. Successful exploitation could allow an unauthenticated remote attacker, under certain preconditions outside the attacker's control, to obtain sensitive information, including credentials.
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Analysis
by VulDB Data Team • 11/03/2026
The identified vulnerability within Hewlett Packard Enterprise (HPE) Networking Fabric Composer represents a critical failure in cryptographic validation mechanisms, specifically categorized as improper certificate verification. This flaw stems from an implementation error where the software fails to rigorously validate the digital certificates presented during secure communication sessions. In standard Transport Layer Security or Secure Sockets Layer implementations, clients and servers must verify that the peer's certificate is signed by a trusted Certificate Authority, has not expired, matches the expected hostname, and possesses valid chain of trust properties. The deficiency in HPE Networking Fabric Composer allows an attacker to bypass these essential checks, effectively treating untrusted or self-signed certificates as legitimate. This breakdown in authentication logic undermines the fundamental security guarantees provided by encrypted channels, creating a pathway for malicious actors to intercept and manipulate network traffic that was presumed to be secure.
From a technical perspective, this vulnerability aligns with Common Weakness Enumeration identifier CWE-295, which describes Improper Certificate Validation. The core issue lies in the application's logic flow during the handshake process of TLS connections. When an unauthenticated remote attacker initiates communication, the Fabric Composer component does not sufficiently scrutinize the authenticity or integrity of the certificate chain provided by the peer. This oversight permits a man-in-the-middle scenario where the attacker can position themselves between the client and the server. By presenting a forged or invalid certificate that the software erroneously accepts, the attacker establishes an encrypted tunnel without proper identity verification. The precondition mentioned in the vulnerability description suggests that while the attack is remote, it may require specific network positioning or configuration states within the target environment to be successful, such as being on the same subnet or having access to a compromised node that can facilitate traffic interception.
The operational impact of this flaw is severe due to its potential for credential theft and data exfiltration. Since HPE Networking Fabric Composer manages complex software-defined networking environments, it handles sensitive configuration data, administrative credentials, and network topology information. By exploiting the improper certificate validation, an attacker can decrypt communications intended to be private, thereby gaining access to plaintext credentials used by administrators or service accounts within the fabric management plane. This compromise not only exposes immediate secrets but also facilitates lateral movement across the enterprise infrastructure. Once initial foothold is gained through stolen credentials, attackers can escalate privileges, modify network policies, disrupt services, or install persistent backdoors. The ability to obtain sensitive information including credentials transforms a cryptographic flaw into a direct gateway for comprehensive system takeover and long-term unauthorized access.
In terms of threat modeling, this vulnerability maps directly to the MITRE ATT&CK technique T1078, specifically Valid Accounts, as it enables attackers to use legitimate-looking but maliciously obtained or forged identities. It also relates to T1557, Adversary-in-the-Middle, where the attacker intercepts communication between two parties who believe they are directly communicating with each other. The exploitation of this flaw allows for passive eavesdropping and active session hijacking, compromising both confidentiality and integrity. Organizations relying on HPE Networking Fabric Composer must recognize that without proper certificate validation, their encrypted channels offer a false sense of security, leaving critical infrastructure management interfaces exposed to sophisticated remote attacks.
Mitigation strategies should focus primarily on applying vendor-provided patches or updates that address the specific code path responsible for the certificate verification logic. Administrators must ensure that all instances of HPE Networking Fabric Composer are updated to versions where this validation flaw has been corrected. In environments where immediate patching is not feasible, network segmentation and strict firewall rules should be implemented to restrict access to the management interface only from trusted IP addresses or specific administrative subnets. Additionally, enforcing mutual TLS authentication with strictly validated client certificates can add a layer of defense, although this does not fully resolve the server-side validation flaw if the attacker controls one end of the connection. Regular auditing of certificate configurations and monitoring for anomalous traffic patterns indicative of man-in-the-middle attacks are also recommended to detect potential exploitation attempts early.