CVE-2026-94577 in Fabric OS
Summary
by MITRE • 10/08/2026
A privilege escalation vulnerability exists in the internal Command-Line Interface (CLI) authorization handling mechanism of Brocade Fabric OS versions before 9.2.2d and 10.0.0 through 10.0.0a1. An authenticated user or local process that can manipulate the process execution environment can bypass Role-Based Access Control (RBAC) validation checks. Successful exploitation allows an attacker to elevate privileges to root
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Analysis
by VulDB Data Team • 10/08/2026
The vulnerability described constitutes a critical privilege escalation flaw within the internal Command-Line Interface authorization logic of Brocade Fabric OS, specifically affecting versions prior to 9.2.2d and ranging from 10.0.0 through 10.0.0a1. This security defect arises from an insufficient validation mechanism in how the system handles process execution environments for authenticated users or local processes. The core technical flaw lies in the failure of the Role-Based Access Control subsystem to properly enforce boundary checks when environment variables are manipulated during command execution. By altering specific environmental parameters, a lower-privileged entity can trick the authorization handler into bypassing standard RBAC validation checks, effectively allowing unauthorized access control mechanisms to be circumvented without triggering appropriate security alerts or denials.
From an operational perspective, this vulnerability enables an attacker who has already gained authenticated access with limited privileges to escalate their rights to root level on the affected switch. Root access provides unrestricted control over the operating system, including the ability to modify critical configuration files, install malicious software, exfiltrate sensitive network topology data, and potentially pivot to other devices within the fabric. This represents a severe compromise of integrity and availability for storage area networks relying on Brocade switches, as it undermines the fundamental principle of least privilege that RBAC is designed to enforce. The impact extends beyond individual device compromise to potential disruption of critical business operations dependent on stable SAN infrastructure.
This vulnerability aligns with CWE-269, which classifies Improper Privilege Management, specifically where a user can elevate privileges by manipulating environmental contexts rather than exploiting a direct code execution flaw in the binary itself. It also maps closely to MITRE ATT&CK technique T1068, Exploitation for Privilege Escalation, particularly within the context of local exploitation and environment variable manipulation often seen in Unix-like systems where processes inherit or modify their environmental state during initialization. The attack vector requires initial authentication, placing it at a medium complexity level regarding access but high severity due to the resulting root-level control.
Mitigation strategies must prioritize immediate patching to the latest stable release of Brocade Fabric OS that addresses this specific authorization handling defect. Organizations should verify their current version against the affected ranges and apply vendor-provided updates as soon as they are available in a controlled maintenance window. In environments where immediate patching is not feasible, strict network segmentation limiting management plane access to only essential administrative hosts can reduce the attack surface. Additionally, enforcing multi-factor authentication for all CLI access and auditing logs for unusual environment variable modifications or unexpected privilege changes can provide early detection indicators while longer-term remediation plans are executed. Regular review of RBAC policies ensures that no unnecessary elevated permissions are granted to user accounts, thereby minimizing potential impact if such a vulnerability were exploited in the future.