CVE-2026-73739 in Fabric Composer
Summary
by MITRE • 09/01/2026
A vulnerability exists in the API of HPE Networking Fabric Composer that allows for an attacker with administrative privileges to access sensitive information in a cleartext format. A successful exploit allows an attacker to retrieve sensitive information that was expected to remain protected within the affected system.
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Analysis
by VulDB Data Team • 09/01/2026
The identified vulnerability resides within the application programming interface of Hewlett Packard Enterprise Networking Fabric Composer, presenting a critical security flaw for environments relying on this infrastructure management platform. The core issue is characterized by improper data handling practices where sensitive information is transmitted or stored in cleartext format despite expectations of protection through encryption or obfuscation mechanisms. This deficiency represents a fundamental failure in implementing adequate confidentiality controls, allowing any entity with administrative privileges to intercept and read protected data without the need for complex cryptographic attacks or privilege escalation beyond the existing admin level.
From a technical perspective, this flaw aligns closely with CWE-319, which classifies cleartext transmission of sensitive information as a significant weakness in software design. The vulnerability likely stems from misconfigured API endpoints that fail to enforce Transport Layer Security protocols for specific data fields or store credentials and configuration details without proper hashing or encryption at rest. In the context of network management systems like Fabric Composer, such exposure is particularly dangerous because these platforms often hold centralized control over network topology, device configurations, and authentication tokens. The lack of encryption means that any administrative session can expose secrets that are intended to be isolated from general view, undermining the principle of least privilege even within an elevated access tier.
The operational impact of this vulnerability extends beyond simple data leakage. An attacker with administrative access who exploits this flaw gains the ability to harvest sensitive information such as passwords, API keys, or internal network configurations in a readable format. This capability facilitates further lateral movement within the enterprise network by providing immediate credentials for other systems that may reuse these secrets. It also compromises the integrity of security audits and compliance reporting, as regulated data is exposed in an unencrypted state during routine administrative operations. The presence of such cleartext data increases the attack surface significantly, turning standard administrative tasks into potential vectors for comprehensive system compromise if session hijacking or memory scraping techniques are employed alongside this API flaw.
Mitigation strategies must focus on enforcing strict encryption standards across all communication channels and storage mechanisms within the Fabric Composer environment. Administrators should ensure that TLS is enabled and configured with strong cipher suites for all API interactions, preventing any data from being transmitted in cleartext over the network. Additionally, sensitive information stored locally or in databases managed by the application must be encrypted using robust algorithms such as AES-256, ensuring that even if storage media are accessed directly, the content remains unreadable without proper decryption keys. Regular security assessments and code reviews should be conducted to identify similar patterns of insecure data handling across other modules within the platform.
This vulnerability can also be contextualized within the MITRE ATT&CK framework under techniques related to Credential Access or Discovery, specifically where adversaries leverage existing access to gather information for subsequent exploitation phases. By addressing this flaw through enhanced encryption policies and rigorous input validation on API responses, organizations can restore the expected level of data confidentiality. It is imperative that HPE releases a patch that corrects these encoding practices, while users should immediately audit their current configurations to ensure no sensitive payloads are being exposed via cleartext endpoints until such updates are applied.