CVE-2026-50608: Acer NitroSense Authentication Bypass Flaw

CVE-2026-50608 is an authentication bypass flaw in Acer NitroSense and PredatorSense system monitoring components. The WebSocket handshake fails to enforce authentication, enabling unauthorized access. This article covers technical details, affected versions, security impact, and mitigation strategies.

CVE-2026-50608 Overview

CVE-2026-50608 is a missing authentication vulnerability [CWE-306] in the Acer System Monitoring component bundled with NitroSense and PredatorSense. The WebSocket handshake process does not require authentication before accepting connections to the service. A local attacker can connect to the exposed WebSocket endpoint and interact with service functionality that should be restricted.

Critical Impact
Unauthorized local access to Acer System Monitoring service functionality through an unauthenticated WebSocket connection.

Affected Products

Acer NitroSense (System Monitoring component)
Acer PredatorSense (System Monitoring component)
Acer System Monitoring service (WebSocket handshake path)

Discovery Timeline

2026-09-17 - CVE-2026-50608 published to the National Vulnerability Database (NVD)
2026-09-17 - Last updated in NVD database

Technical Details for CVE-2026-50608

Vulnerability Analysis

The Acer System Monitoring component exposes a local WebSocket service used by NitroSense and PredatorSense to query sensor data and issue control commands. The handshake stage does not validate that the requesting client is authorized. Any local process can complete the upgrade to a WebSocket session and begin exchanging messages with the service.

Because the service runs alongside a system monitoring and control utility, its message interface may expose functionality that a non-privileged user should not reach directly. The attack requires local access, which limits the exposure to users or processes already present on the host.

Root Cause

The root cause is a missing authentication check on the WebSocket handshake, tracked as [CWE-306] Missing Authentication for Critical Function. The service accepts the HTTP Upgrade: websocket request without verifying a token, origin restriction, or process identity before establishing the session.

Attack Vector

Exploitation requires local access to the machine where NitroSense or PredatorSense is installed. A local process opens a WebSocket connection to the loopback endpoint exposed by the System Monitoring service. Because the handshake proceeds without authentication, the attacker can send service commands and receive responses that are normally reserved for the trusted client UI.

No public proof-of-concept is listed in the CVE record. Refer to the Acer Community Article for vendor guidance on affected versions and remediation.

Detection Methods for CVE-2026-50608

Indicators of Compromise

Unexpected local WebSocket connections to the Acer System Monitoring service from processes other than the NitroSense or PredatorSense client binaries.
Repeated HTTP/1.1 101 Switching Protocols responses from the monitoring service to non-standard client processes.
Presence of unknown scripts or binaries querying loopback ports associated with Acer System Monitoring.

Detection Strategies

Monitor process-to-loopback network activity on endpoints running NitroSense or PredatorSense and flag non-Acer processes that open sessions to the monitoring service.
Correlate WebSocket connections with parent process lineage to identify unsigned or user-space binaries interacting with the service.
Baseline expected client processes and alert on deviations that indicate direct API access.

Monitoring Recommendations

Enable command-line and process-creation logging on Windows endpoints where Acer utilities are installed.
Ingest endpoint telemetry into a centralized data lake to hunt for anomalous local WebSocket clients across the fleet.
Track installed versions of NitroSense and PredatorSense in the asset inventory to prioritize patching.

How to Mitigate CVE-2026-50608

Immediate Actions Required

Identify all endpoints with NitroSense or PredatorSense installed and confirm the version of the Acer System Monitoring component.
Apply the vendor-supplied update referenced in the Acer Community Article as soon as it is available for the affected build.
Restrict interactive and remote access on affected endpoints to reduce local attacker opportunities.

Patch Information

Acer publishes remediation guidance through its knowledge base. Consult the Acer Community Article for the fixed build numbers and download instructions for NitroSense and PredatorSense.

Workarounds

Uninstall NitroSense or PredatorSense on systems that do not require hardware monitoring or fan control features.
Stop and disable the Acer System Monitoring service when the utility is not actively in use.
Apply host firewall rules that limit which local processes can reach the loopback port used by the monitoring service, where supported by the endpoint platform.

bash

# Example: stop and disable the Acer System Monitoring service on Windows
sc.exe stop "Acer System Monitoring"
sc.exe config "Acer System Monitoring" start= disabled