CVE-2026-95736 in Fabric Composer
Summary
by MITRE • 11/03/2026
Improper certificate validation vulnerabilities exist in the affected interface of HPE Networking Fabric Composer, which could be exploited by an unauthenticated adjacent attacker if certain preconditions outside of the attacker's control are met. Successful exploitation could allow an attacker to intercept sensitive information.
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Analysis
by VulDB Data Team • 11/03/2026
The vulnerability identified within Hewlett Packard Enterprise (HPE) Networking Fabric Composer represents a critical failure in cryptographic implementation, specifically categorized under CWE-295: Improper Certificate Validation. This flaw resides in the application's handling of Transport Layer Security (TLS) or Secure Sockets Layer (SSL) connections during authentication and data exchange processes. The core technical deficiency involves the software's inability to rigorously verify the authenticity and integrity of digital certificates presented by remote peers. In a secure environment, a client must validate that the server's certificate is signed by a trusted Certificate Authority, has not expired, matches the expected hostname, and possesses valid chain-of-trust properties. The absence or bypassing of these checks means the application accepts any certificate provided by an adjacent network entity without question, effectively nullifying the confidentiality guarantees intended by encryption protocols.
From an operational perspective, this vulnerability enables a Man-in-the-Middle (MitM) attack scenario where an adversary positioned on the same local area network segment can intercept and potentially modify communications between HPE Networking Fabric Composer and other managed devices or management interfaces. Because the attacker is described as unauthenticated and adjacent, they do not need valid credentials to initiate this exploit but rather rely on their physical or logical proximity within the broadcast domain. The preconditions mentioned suggest that while the vulnerability exists in the code logic, successful exploitation may depend on network topology factors such as ARP spoofing capabilities or lack of micro-segmentation controls that would otherwise isolate management traffic from general user networks. This aligns with MITRE ATT&CK technique T1557: Adversary-in-the-Middle, where attackers position themselves to eavesdrop on encrypted communications by bypassing certificate validation checks.
The impact of this vulnerability is severe due to the sensitive nature of data processed by HPE Networking Fabric Composer. This platform typically manages network infrastructure configurations, security policies, and device states across enterprise environments. Interception of these communications allows an attacker to harvest credentials, session tokens, configuration files containing network topology maps, and potentially command-and-control instructions sent to managed switches or routers. The exposure of such data compromises the confidentiality of the entire network architecture and can serve as a foothold for further lateral movement within the organization's infrastructure. Furthermore, if certificate validation is also bypassed in outgoing connections initiated by the Fabric Composer, it could allow attackers to inject malicious configuration updates into the management plane, leading to integrity violations that disrupt service availability or create backdoors.
Mitigation strategies must address both immediate remediation and long-term architectural hardening. The primary corrective action is to apply the vendor-provided software patch that enforces strict certificate validation rules as per industry standards such as RFC 5280 for X.509 Certificate Validation. Administrators should ensure that all internal certificates used within their HPE environment are issued by a trusted, private Public Key Infrastructure (PKI) rather than relying on self-signed or public CA certificates which may be easier to spoof in certain contexts. Additionally, network segmentation is critical; management interfaces for Fabric Composer should be placed in isolated VLANs with strict Access Control Lists that restrict access only to authorized management workstations and servers. Implementing mutual TLS authentication can further mitigate this risk by requiring both parties to present valid certificates, ensuring bidirectional trust verification. Regular audits of certificate expiration dates and chain validity are also recommended to prevent accidental fallback behaviors that might trigger these validation bypasses during normal operations.