CVE-2026-82369: Brocade SANnav CLI RCE Vulnerability

CVE-2026-82369 Overview

CVE-2026-82369 is a command injection vulnerability in the Brocade SANnav CLI scripting component. Insufficient input sanitization of shell metacharacters allows authenticated users to escape restricted execution contexts on managed fabric switches. An attacker with command execution permissions can bypass command allow-lists and run arbitrary shell commands, obtaining full administrative access on target switches. The flaw affects all Brocade SANnav versions before 3.0.1a and is tracked under CWE-78 (Improper Neutralization of Special Elements used in an OS Command).

Critical Impact
Authenticated adjacent-network attackers can break out of restricted CLI contexts and achieve full administrative control of Brocade fabric switches managed by SANnav.

Affected Products

Brocade SANnav versions prior to 3.0.1a
Brocade fabric switches managed through the SANnav CLI scripting component
Storage Area Network (SAN) environments relying on SANnav for centralized fabric management

Discovery Timeline

2026-09-23 - CVE-2026-82369 published to the National Vulnerability Database (NVD)
2026-09-24 - Last updated in NVD database

Technical Details for CVE-2026-82369

Vulnerability Analysis

The Brocade SANnav CLI scripting component accepts user-supplied input intended for execution against managed fabric switches. The component enforces an allow-list of permitted commands to constrain what authenticated operators can run. However, the input handler fails to neutralize shell metacharacters such as ;, |, &, backticks, and $() before the input is passed to the underlying shell.

An authenticated user with command execution permissions can embed metacharacters inside otherwise permitted commands. The shell interprets these metacharacters and executes attacker-controlled commands outside the allow-list. This effectively breaks the restricted execution context and delivers unauthorized code execution on the target switch.

Successful exploitation grants full administrative switch access, exposing SAN fabric configuration, zoning, and traffic paths. Because SANnav centrally manages multiple switches, the flaw can be leveraged across an entire fabric.

Root Cause

The root cause is missing or incomplete sanitization of shell metacharacters in the CLI scripting component. The allow-list validates the command name but does not properly escape or reject argument content that contains shell control operators. This aligns with the classic CWE-78 pattern of OS command injection.

Attack Vector

The attack requires network adjacency to the SANnav management interface and valid credentials with command execution privileges. No user interaction is required. An attacker crafts a request containing a permitted command concatenated with shell metacharacters and additional commands. The CLI component passes the composite string to the shell, which executes both the sanctioned command and the injected payload with switch administrative privileges. Refer to the Broadcom Security Advisory for vendor-specific technical details.

Detection Methods for CVE-2026-82369

Indicators of Compromise

Unexpected shell processes or child processes spawned by the SANnav CLI scripting component on managed switches
CLI audit log entries containing shell metacharacters such as ;, |, &&, `, or $() inside command arguments
Administrative configuration changes on fabric switches originating from non-administrative SANnav accounts
Outbound network connections initiated from switches to unusual destinations following SANnav CLI activity

Detection Strategies

Inspect SANnav CLI audit logs for command arguments containing shell control operators and compare against the documented allow-list
Correlate authenticated SANnav sessions with switch-side syslog entries showing unexpected commands or privilege changes
Baseline normal CLI scripting workflows and alert on deviations such as new binaries invoked, chained commands, or shell interpreters launched

Monitoring Recommendations

Forward SANnav management logs and switch syslog data to a centralized SIEM for correlation and long-term retention
Enable alerting on authentication events from accounts with CLI scripting privileges, especially outside change windows
Monitor the SANnav management network segment for unauthorized adjacent hosts that could originate authenticated attacks

How to Mitigate CVE-2026-82369

Immediate Actions Required

Upgrade Brocade SANnav to version 3.0.1a or later as directed by the Broadcom Security Advisory
Audit SANnav user accounts and revoke CLI scripting permissions from users who do not require them
Rotate credentials for any account with CLI scripting privileges, particularly shared or service accounts
Review recent CLI audit logs for evidence of shell metacharacter injection attempts

Patch Information

Broadcom addresses CVE-2026-82369 in Brocade SANnav 3.0.1a. All prior versions are affected. Administrators should apply the vendor-supplied upgrade following the guidance in the Broadcom Security Advisory. No supported downgrade path exists once the fix is deployed.

Workarounds

Restrict network access to the SANnav management interface to a dedicated, tightly controlled management VLAN
Enforce least privilege by limiting CLI scripting permissions to a minimal set of trusted administrators
Require multi-factor authentication and short session lifetimes for all SANnav accounts with command execution rights
Increase audit log verbosity for CLI scripting activity and forward records to an external log store until patching is complete

bash

# Configuration example: restrict SANnav management access at the network layer
# Replace <mgmt_subnet> and <sannav_host> with environment-specific values
iptables -A INPUT -p tcp -s <mgmt_subnet> -d <sannav_host> --dport 443 -j ACCEPT
iptables -A INPUT -p tcp -d <sannav_host> --dport 443 -j DROP