CVE-2026-78484: Dell Secure Connect Gateway RCE Vulnerability

CVE-2026-78484 Overview

CVE-2026-78484 is an OS Command Injection vulnerability [CWE-77] affecting Dell Secure Connect Gateway (SCG) 5.0. The flaw exists in SCG 5.0 Appliance versions prior to 5.36.00.16 and SCG 5.0 Application versions prior to 5.36.00.00. The vulnerability stems from improper neutralization of special elements passed to operating system commands. A low-privileged attacker with local access to the appliance can inject arbitrary commands and execute them in the underlying operating system context.

Critical Impact
Successful exploitation allows a local, low-privileged attacker to execute arbitrary OS commands, compromising confidentiality, integrity, and availability of the Secure Connect Gateway system.

Affected Products

Dell Secure Connect Gateway 5.0 Appliance versions prior to 5.36.00.16
Dell Secure Connect Gateway 5.0 Application versions prior to 5.36.00.00
Dell SCG Virtual Edition (per advisory DSA-2026-382)

Discovery Timeline

2026-09-09 - CVE-2026-78484 published to the National Vulnerability Database
2026-09-09 - Last updated in NVD database

Technical Details for CVE-2026-78484

Vulnerability Analysis

Dell Secure Connect Gateway is a support-connectivity solution that channels telemetry and remote support traffic between customer infrastructure and Dell backend services. CVE-2026-78484 is an OS Command Injection weakness classified under CWE-77. The affected component fails to neutralize shell metacharacters within input that ultimately reaches an OS command interpreter. An authenticated attacker with local, low-privileged access can craft input containing shell control characters to break out of the intended command and append attacker-controlled commands. Execution occurs in the process context of the SCG service, granting the attacker broader access than their own account permits.

Root Cause

The root cause is improper input neutralization before command construction. Instead of using parameterized process execution APIs or strict allow-list validation, the vulnerable code path concatenates user-controlled data into a shell command string. Characters such as ;, |, backticks, and $() are not stripped or escaped, allowing command boundary injection.

Attack Vector

Exploitation requires local access and valid low-privileged credentials on the SCG appliance. The attacker submits input containing embedded OS commands through the vulnerable interface exposed to authenticated users. When the SCG process invokes the shell to process this input, the injected commands execute alongside the intended operation. No user interaction is required beyond the attacker's own actions, and the scope remains unchanged within the appliance.

No public proof-of-concept code has been released. Refer to the Dell Security Update Advisory for vendor-provided technical guidance.

Detection Methods for CVE-2026-78484

Indicators of Compromise

Unexpected child processes spawned by the SCG service account, particularly shell interpreters such as sh, bash, or /bin/dash
SCG application logs containing shell metacharacters (;, |, &&, $(), backticks) in fields that normally accept structured data
New or modified files under SCG working directories that do not correspond to a legitimate update or configuration change
Outbound network connections initiated by SCG processes to destinations outside the Dell support endpoint set

Detection Strategies

Baseline the normal process tree of the SCG appliance and alert on deviations, especially interpreter execution under the SCG service account
Enable auditd or equivalent syscall auditing on the appliance to record execve calls and their arguments
Correlate authenticated SCG session activity with process creation events to identify low-privileged users triggering command execution

Monitoring Recommendations

Forward SCG appliance logs, authentication events, and process telemetry to a centralized logging or SIEM platform
Monitor local authentication attempts to the SCG appliance and flag privilege anomalies
Review Dell advisory DSA-2026-382 periodically for updated indicators or supplementary detection guidance

How to Mitigate CVE-2026-78484

Immediate Actions Required

Upgrade Dell SCG 5.0 Appliance to version 5.36.00.16 or later
Upgrade Dell SCG 5.0 Application to version 5.36.00.00 or later
Audit and reduce the set of accounts with local access to the SCG appliance
Rotate credentials for any account with local access to the appliance following the patch

Patch Information

Dell has released fixed versions addressed in security advisory DSA-2026-382. Administrators should apply SCG 5.0 Appliance 5.36.00.16 or SCG 5.0 Application 5.36.00.00 as documented in the Dell Security Update Advisory. Verify the running version after upgrade and confirm the appliance restarts cleanly.

Workarounds

Restrict local access to the SCG appliance to a minimal set of trusted administrators until the patch is applied
Place the SCG management interface behind network segmentation controls that limit exposure to jump hosts
Enforce strong authentication and monitor session activity on the appliance while remediation is pending

bash

# Verify installed Dell SCG version after patching
# Run from the SCG appliance shell
cat /opt/dell/scg/VERSION

# Confirm the version meets or exceeds the fixed release
# Appliance: 5.36.00.16 or later
# Application: 5.36.00.00 or later