CVE-2026-67267: Dell Command Update Information Disclosure

CVE-2026-67267 Overview

CVE-2026-67267 is an information disclosure vulnerability in Dell Command Update (DCU) versions prior to 5.7.1. The flaw is categorized as Exposure of Sensitive System Information to an Unauthorized Control Sphere [CWE-497]. A low-privileged local attacker can exploit this weakness to read sensitive system information that should be restricted. Dell disclosed the issue in security advisory DSA-2026-309 and released a fixed build in version 5.7.1. The vulnerability requires local access and low privileges, and does not affect integrity or availability of the host system.

Critical Impact
A local, low-privileged attacker can retrieve sensitive system information exposed by Dell Command Update, aiding follow-on attacks and privilege escalation attempts.

Affected Products

Dell Command Update (DCU) versions prior to 5.7.1
Dell client systems where Dell Command Update is pre-installed or deployed by IT
Windows endpoints managing Dell driver, BIOS, and firmware updates through DCU

Discovery Timeline

2026-08-19 - CVE-2026-67267 published to the National Vulnerability Database
2026-08-20 - Entry last modified in the NVD database

Technical Details for CVE-2026-67267

Vulnerability Analysis

Dell Command Update is a client utility that manages driver, BIOS, and firmware updates on Dell endpoints. The tool runs with elevated context to interact with system components and maintains logs, temporary files, and configuration data describing the host. In versions before 5.7.1, DCU exposes sensitive system information to a sphere of access that should not receive it. A locally authenticated user with low privileges can read this data without holding administrative rights. The exposed information may include system inventory, configuration attributes, or update-related artifacts that describe the endpoint state. Attackers commonly use this class of information disclosure to profile a target before attempting privilege escalation or lateral movement.

Root Cause

The root cause is an [CWE-497] Exposure of Sensitive System Information to an Unauthorized Control Sphere. DCU stores or emits data intended for privileged callers in a location or channel accessible to standard users on the same machine. The application does not sufficiently restrict access controls, resulting in disclosure across the trust boundary between administrative and non-administrative users.

Attack Vector

Exploitation requires local access to a Windows endpoint running a vulnerable version of Dell Command Update. The attacker authenticates as any low-privileged user, then reads the exposed data source produced by DCU. No user interaction from another account is required. The confidentiality impact is high, while integrity and availability are not affected. Dell has not indicated public exploit code exists, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Since no verified proof-of-concept code has been published, refer to the Dell Security Update DSA-2026-309 for authoritative technical details.

Detection Methods for CVE-2026-67267

Indicators of Compromise

Presence of Dell Command Update binaries with a version below 5.7.1 on managed endpoints
Access to DCU log, cache, or configuration files by non-administrative user accounts
Unexpected reads of files under DCU installation or ProgramData paths by standard user processes

Detection Strategies

Inventory installed software and flag hosts running Dell Command Update versions earlier than 5.7.1
Monitor file-read events on DCU directories from low-privileged user contexts using endpoint telemetry
Correlate reconnaissance behavior on Dell endpoints, such as enumeration of system inventory files, with subsequent privilege escalation attempts

Monitoring Recommendations

Enable process and file access auditing on Dell Command Update installation directories
Alert on non-administrative accounts reading DCU state or log files
Track DCU version drift across the fleet through configuration management or software asset tooling

How to Mitigate CVE-2026-67267

Immediate Actions Required

Upgrade Dell Command Update to version 5.7.1 or later on all Dell endpoints
Identify vulnerable installations through software inventory and prioritize shared or multi-user systems
Restrict interactive local logon on sensitive Dell endpoints to reduce the pool of potential local attackers

Patch Information

Dell has released Dell Command Update version 5.7.1 to remediate CVE-2026-67267. Deploy the fixed build following the guidance in the Dell Security Update DSA-2026-309. Confirm the installed version after deployment by checking the DCU application properties or querying the software inventory.

Workarounds

Where immediate patching is not possible, tighten NTFS permissions on DCU data directories to restrict read access to administrators and SYSTEM
Limit local user accounts on affected endpoints and enforce least-privilege policies
Remove Dell Command Update from systems that do not require it until the patched version can be deployed

bash

# Verify Dell Command Update version on a Windows endpoint
Get-ItemProperty "HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\*" |
  Where-Object { $_.DisplayName -like "Dell Command*Update*" } |
  Select-Object DisplayName, DisplayVersion, Publisher