CVE-2026-50228 Overview
CVE-2026-50228 affects Acer NitroSense software versions up to and including 5.2.63. The application exposes an Electron DevTools endpoint on localhost TCP port 9993 with Chromium remote debugging enabled in the production build. An unauthenticated local attacker can connect to this endpoint and execute JavaScript inside the privileged application context. This leads to arbitrary code execution under the privileges of the NitroSense process. The issue is categorized under [CWE-489] Active Debug Code and stems from leaving developer-only debugging functionality enabled in a shipped consumer application.
Critical Impact
Any local user or process on an affected system can connect to 127.0.0.1:9993 and execute arbitrary code within the NitroSense application context without authentication.
Affected Products
- Acer NitroSense versions up to and including 5.2.63
- Electron-based Acer NitroSense builds with Chromium remote debugging enabled
- Windows systems shipped with vulnerable NitroSense preinstalled
Discovery Timeline
- 2026-09-23 - CVE-2026-50228 published to NVD
- 2026-09-23 - Last updated in NVD database
Technical Details for CVE-2026-50228
Vulnerability Analysis
Acer NitroSense is built on the Electron framework, which combines Chromium and Node.js to render desktop applications. Electron applications intended for production should never expose the Chromium DevTools Protocol (CDP) endpoint. In vulnerable NitroSense builds, the application starts with remote debugging enabled and binds to localhost TCP port 9993. Any local process can enumerate DevTools targets over HTTP, obtain a WebSocket debugger URL, and attach as a debugger client. Once attached, the attacker uses Runtime.evaluate or similar CDP methods to run JavaScript inside a renderer or main process context. Because Node.js integration is available in the privileged Electron context, JavaScript execution translates directly to arbitrary operating system command execution under the user account running NitroSense.
Root Cause
The root cause is active debug code left enabled in a production build [CWE-489]. Electron exposes the --remote-debugging-port switch and equivalent programmatic options for development use. NitroSense ships with this switch effectively enabled on port 9993, binding a fully functional CDP endpoint without authentication, origin validation, or transport encryption.
Attack Vector
Exploitation requires local access but no user interaction and no prior authentication to the application. An attacker with a foothold on the host, including a low-privilege user or a sandboxed process capable of making localhost TCP connections, enumerates DevTools targets by requesting http://127.0.0.1:9993/json. The response returns WebSocket debugger URLs for each Electron target. The attacker then opens a WebSocket to the target and issues CDP commands such as Runtime.evaluate with arbitrary JavaScript. In Electron contexts where Node integration is present, this JavaScript can call require('child_process').exec(...) to spawn processes under the NitroSense user context. See the Acer Community Knowledge Base advisory for vendor guidance.
Stop Remote Code Execution Before It Runs
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Stop Exploit AttemptsDetection Methods for CVE-2026-50228
Indicators of Compromise
- Unexpected listening socket on 127.0.0.1:9993 associated with the NitroSense process
- Outbound child processes spawned by NitroSense.exe such as cmd.exe, powershell.exe, or conhost.exe without user interaction
- HTTP requests to http://127.0.0.1:9993/json or /json/version originating from non-browser processes
- WebSocket connections from unexpected local clients to the NitroSense debugger endpoint
Detection Strategies
- Enumerate listening TCP sockets on endpoints and alert on any process binding to port 9993, especially Electron-based utility software
- Correlate process telemetry to flag NitroSense.exe spawning script interpreters or shell binaries
- Inspect loopback network telemetry for HTTP paths matching /json, /json/version, or /devtools/ on non-standard ports
Monitoring Recommendations
- Baseline the expected child-process tree of NitroSense.exe and alert on deviations
- Monitor for command-line arguments containing --remote-debugging-port or --inspect on Electron binaries
- Log and review local WebSocket connections to Electron applications running with elevated user privileges
How to Mitigate CVE-2026-50228
Immediate Actions Required
- Update Acer NitroSense to the fixed version published in the Acer Community Knowledge Base advisory
- Uninstall NitroSense on systems where the utility is not required
- Restrict interactive and remote logon rights on shared workstations that run vulnerable NitroSense builds
Patch Information
Acer has published guidance and updates through the Acer Community Knowledge Base. Administrators should deploy the vendor-provided update to any endpoint running NitroSense at version 5.2.63 or earlier and confirm the DevTools endpoint is no longer bound to port 9993 after patching.
Workarounds
- Terminate the NitroSense process and disable its auto-start entries until the patched version is deployed
- Block local connections to TCP port 9993 using a host-based firewall rule where operationally feasible
- Prevent execution of NitroSense.exe through application control policies such as Windows Defender Application Control or AppLocker on high-value systems
# Example host firewall rule to block loopback access to the DevTools port
netsh advfirewall firewall add rule name="Block NitroSense DevTools 9993" \
dir=in action=block protocol=TCP localport=9993 interfacetype=loopback
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
