CVE-2026-7539 Overview
CVE-2026-7539 is a local privilege escalation vulnerability in the HP Accessory WMI Provider installer used by certain HP Docking Stations. The flaw stems from insecure temporary file handling [CWE-379], which can allow a local attacker to escalate privileges or execute arbitrary code on affected systems. HP has acknowledged the issue and is releasing software updates to address the vulnerability. The weakness requires local access and some user interaction, limiting remote exploitation but increasing risk on shared or multi-user endpoints. Organizations using HP Docking Stations with the bundled Accessory WMI Provider installer should review the HP Security Advisory and apply updates.
Critical Impact
A local, low-privileged user could leverage insecure temporary file handling in the HP Accessory WMI Provider installer to execute arbitrary code or escalate to higher privileges on Windows systems running affected HP Docking Station software.
Affected Products
- HP Accessory WMI Provider installer (bundled with select HP Docking Stations)
- HP Docking Stations utilizing the affected installer package
- Windows endpoints running the vulnerable HP Accessory WMI Provider component
Discovery Timeline
- 2026-06-24 - CVE-2026-7539 published to NVD
- 2026-06-25 - Last updated in NVD database
Technical Details for CVE-2026-7539
Vulnerability Analysis
The vulnerability resides in the HP Accessory WMI Provider installer, a component shipped alongside HP Docking Station software. According to HP's advisory, the installer contains a flaw that may permit escalation of privilege and arbitrary code execution on the host. The weakness is mapped to [CWE-379], which covers the creation of temporary files in directories with insecure permissions. When an installer writes or reads files from a world-writable or predictable temporary location, a local attacker can stage malicious content that the installer later executes in a privileged context. This pattern is a well-known source of local privilege escalation on Windows systems where installers run with elevated rights.
Root Cause
The root cause is improper handling of temporary files during the installation process. The installer relies on a temporary directory whose access controls allow non-privileged users to place, modify, or replace files referenced by the installer. Because installers typically execute in the SYSTEM or administrator context, any attacker-controlled file consumed by the installer inherits those privileges at execution time.
Attack Vector
Exploitation requires local access to the system and some user interaction, such as triggering the vulnerable installer. A local attacker with standard user privileges plants a malicious payload, such as a DLL or executable, in the predictable temporary path used by the installer. When the installer runs, either at user invocation or during an update flow, it loads or executes the attacker-supplied file under elevated privileges. The result is arbitrary code execution and full privilege escalation on the affected host. The attack complexity is elevated by timing and path requirements, but the impact spans confidentiality, integrity, and availability.
No public proof-of-concept exploit is currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. The EPSS score is 0.096%, indicating low predicted near-term exploitation likelihood.
Detection Methods for CVE-2026-7539
Indicators of Compromise
- Unexpected files, DLLs, or executables written by non-privileged users into temporary directories referenced by HP installer processes.
- Child processes spawned by the HP Accessory WMI Provider installer that originate from user-writable paths.
- Modification timestamps on installer temp artifacts that predate installer execution by standard users.
Detection Strategies
- Monitor process creation events where the HP Accessory WMI Provider installer launches binaries from %TEMP%, %APPDATA%, or other user-writable locations.
- Alert on file write operations to installer temp directories by non-administrative users immediately prior to installer execution.
- Correlate WMI provider registrations with unexpected DLL load events from non-standard paths.
Monitoring Recommendations
- Enable Windows process command-line and module load auditing on endpoints that use HP Docking Stations.
- Track installation and update events for HP software through Windows Installer event logs (Event IDs 1033, 1042).
- Review elevation events tied to HP installer executables across managed endpoints.
How to Mitigate CVE-2026-7539
Immediate Actions Required
- Apply the updated HP Accessory WMI Provider installer as published in the HP Security Advisory.
- Inventory endpoints with HP Docking Stations and confirm the version of the installed HP Accessory WMI Provider.
- Restrict standard user write access to temporary directories used by installer workflows where feasible.
- Limit local administrative rights on endpoints to reduce the population of users who can stage exploitation primitives.
Patch Information
HP is releasing software updates to remediate CVE-2026-7539. Refer to the HP Security Advisory for the list of affected versions and the corresponding fixed installer packages. Deploy the updated installer through standard software distribution channels and verify successful installation on all managed endpoints.
Workarounds
- Avoid running the vulnerable HP Accessory WMI Provider installer until the patched version is deployed.
- Enforce least privilege so standard users cannot execute installers that elevate to SYSTEM.
- Use application control policies to block execution of unsigned binaries from user-writable temporary paths.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
