CVE-2026-50605: Acer Agent Service Privilege Escalation

CVE-2026-50605 is a privilege escalation vulnerability in Acer Agent Service affecting NitroSense and PredatorSense. Insufficient access controls allow local users to perform unauthorized registry operations. This article covers technical details, affected versions, system impact, and mitigation strategies.

CVE-2026-50605 Overview

CVE-2026-50605 is an improper access control vulnerability [CWE-284] in the Acer Agent Service component bundled with the NitroSense and PredatorSense utilities. The privileged service does not adequately restrict access to sensitive registry operations. An authenticated local user can invoke these operations to modify registry values that the service processes with elevated privileges. Successful exploitation can lead to local privilege escalation and full compromise of the affected Windows system.

Critical Impact
A local, low-privileged user can escalate to SYSTEM-level control by abusing unauthorized registry operations exposed through the Acer Agent Service.

Affected Products

Acer NitroSense (bundled Acer Agent Service)
Acer PredatorSense (bundled Acer Agent Service)
Acer Agent Service component shipped with the above utilities

Discovery Timeline

2026-09-17 - CVE-2026-50605 published to the National Vulnerability Database (NVD)
2026-09-17 - Last updated in NVD database

Technical Details for CVE-2026-50605

Vulnerability Analysis

The Acer Agent Service runs as a privileged Windows service to support the NitroSense and PredatorSense system utilities. These utilities expose hardware controls such as fan curves, performance profiles, and lighting configuration to standard users. To bridge unprivileged UI calls into privileged operations, the service accepts requests from local clients and performs registry reads and writes on their behalf.

The service does not enforce sufficient authorization on the caller before executing those registry operations. Any authenticated local user can trigger operations that should be restricted to administrators. Because the service runs with elevated rights, the resulting registry writes execute in a privileged security context. This mismatch between caller privilege and executed operation is the core defect described in [CWE-284].

Root Cause

The root cause is missing or insufficient access control checks inside a privileged service endpoint. The service trusts local callers to invoke sensitive registry functionality without validating that the caller holds the required privileges. Registry paths that influence service or system behavior become writable indirectly through the service.

Attack Vector

Exploitation requires local access and a valid, low-privileged account on the target machine. The attacker interacts with the Acer Agent Service through its local interface and requests registry operations that the service performs under its own elevated token. By steering those operations at registry keys consumed by privileged processes, the attacker can influence code loading, service configuration, or auto-start behavior and escalate to SYSTEM. Refer to the Acer Community Knowledge Base Article for vendor-supplied technical details.

Detection Methods for CVE-2026-50605

Indicators of Compromise

Unexpected registry modifications performed by the Acer Agent Service process on keys unrelated to NitroSense or PredatorSense functionality.
Child processes or DLL loads originating from paths recently written by the Acer Agent Service.
Local, non-administrative user sessions immediately preceding privilege escalation activity on systems with NitroSense or PredatorSense installed.

Detection Strategies

Monitor process behavior of the Acer Agent Service binary for registry writes outside its expected key namespace.
Alert on standard user accounts interacting with the Acer Agent Service local endpoint followed by SYSTEM-context process creation.
Correlate installation of NitroSense or PredatorSense with subsequent privilege escalation telemetry across the fleet.

Monitoring Recommendations

Enable Windows registry auditing on HKLM\SYSTEM, HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run, and service configuration keys.
Forward Sysmon Event IDs 12, 13, and 14 for registry activity and Event ID 1 for process creation to your SIEM.
Track service restarts and configuration changes for the Acer Agent Service across managed endpoints.

How to Mitigate CVE-2026-50605

Immediate Actions Required

Inventory all endpoints with NitroSense, PredatorSense, or the Acer Agent Service installed.
Apply the vendor-supplied update referenced in the Acer Community Knowledge Base Article as soon as it is available.
Restrict local logon on affected devices to trusted users until patching is complete.

Patch Information

Acer has published guidance through the Acer Community Knowledge Base Article. Administrators should follow that advisory for the fixed version numbers and update procedure for the Acer Agent Service, NitroSense, and PredatorSense. Deploy the updated package through your standard software management tooling and verify the service version after installation.

Workarounds

Uninstall NitroSense and PredatorSense on systems where the utilities are not required.
Disable the Acer Agent Service using sc config "Acer Agent Service" start= disabled where hardware control features are not needed.
Limit interactive local access on affected endpoints and enforce least-privilege for standard user accounts.

bash

# Configuration example: query and disable the Acer Agent Service on affected hosts
sc query "Acer Agent Service"
sc stop "Acer Agent Service"
sc config "Acer Agent Service" start= disabled