CVE-2026-50228
Executive Summary
CVE-2026-50228 is a local privilege and code execution vulnerability in Acer NitroSense software versions up to and including 5.2.63. The application ships with Chromium remote debugging (Electron DevTools) enabled in production, bound to localhost TCP port 9993. An unauthenticated local attacker who can reach that loopback endpoint can execute arbitrary JavaScript in the privileged application context, resulting in arbitrary code execution on the host. No CVSS score, EPSS score, PoC, or patch is currently available, and Acer NitroSense is commonly preinstalled on consumer and gaming laptops, giving the flaw a broad but locally-scoped attack surface.
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Technical Analysis
The root cause is classified as CWE-489: Active Debug Code. Acer NitroSense is an Electron-based application that leaves the Chromium DevTools remote debugging interface enabled in the shipped, production build. The debugging endpoint listens on localhost TCP port 9993 and requires no authentication. Because remote debugging grants full access to the renderer's JavaScript execution environment and the associated Node/Electron integration, any process — or any local user — able to open a TCP connection to 127.0.0.1:9993 can attach and inject JavaScript.
Electron applications run with the privileges of the user account that launched them. NitroSense is a system-management utility and is typically started at boot or invoked with elevated rights to control fans, power profiles, keyboard lighting, and hardware sensors. Consequently, JavaScript executed through the exposed DevTools context runs inside a process that may hold high-integrity or administrative privileges, allowing the injected code to invoke native functionality through Electron's runtime bindings and the underlying operating system.
The attack surface is explicitly local: the endpoint binds to localhost, so exploitation requires a foothold on the same machine. This is a classic post-compromise escalation and defense-evasion vector. The combination of unauthenticated access, no user interaction, and the privileged nature of the host process makes the vulnerability high impact for confidentiality, integrity, and availability within the context of an already-present local presence.
No technical details beyond the NVD description are available. The exact DevTools protocol handshake, the JavaScript APIs reachable in the NitroSense renderer, and the precise privilege level of the NitroSense process are not documented in the provided data and are not asserted here.
Exploitation Scenarios
The attack chain is inferred directly from the NVD description, which states that an unauthenticated local attacker can connect to the Electron DevTools endpoint on localhost TCP port 9993 and execute JavaScript in the privileged application context.
Reconnaissance / target identification. The attacker, already present on the host through any local vector — malicious download, phishing payload, shared workstation, or a low-privileged account — enumerates listening services on the loopback interface. Identification is trivial: confirm a listener on TCP port 9993 consistent with an Electron DevTools endpoint, and confirm Acer NitroSense ≤ 5.2.63 is installed.
Triggering the flaw class. This is Active Debug Code (CWE-489). The attacker connects to 127.0.0.1:9993. No authentication is required, so the connection is accepted and the debugging protocol is available to the caller. The precondition is solely local network reachability to the loopback port; no credentials, tokens, or user interaction are needed.
Payload / execution method. Using the DevTools protocol, the attacker submits JavaScript for execution inside the NitroSense renderer context. Because remote debugging exposes script evaluation, the supplied code runs in the privileged application context. The exact payload primitives depend on which runtime bindings the NitroSense process exposes and its privilege level; the NVD description confirms only that JavaScript execution in that context yields arbitrary code execution.
Post-exploitation impact. Successful execution grants arbitrary code execution at the privilege level of the NitroSense process, which is frequently elevated. This enables persistence installation, credential and data access, modification of system configuration, and lateral movement from the compromised host.
No public PoC is available. The attack chain above is based on the stated vulnerability class and the vendor/product/version data; no specific function names, endpoints, or implementation details are fabricated.
Impact Assessment
Impact is characterized as high for confidentiality, integrity, and availability, with a local attack vector, no privileges required, and no user interaction (per the vector CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; no official score is published). Business consequences depend on the privilege level of the NitroSense process, which frequently runs with elevated host authority. In enterprise and shared-device environments, a local unprivileged user could escalate to the application's context, then pivot to persistence, data theft, or full system control. The blast radius is bounded to hosts where NitroSense ≤ 5.2.63 is installed and running, which includes a large installed base of Acer consumer and gaming laptops that ship with the utility preinstalled. Because the endpoint is local-only, this is not remotely wormable, but it is an attractive local escalation and post-exploitation primitive. No EPSS score, CISA KEV listing, or exploit-in-the-wild reporting is available.
Detection Guidance
Sigma Rule
title: Local Connection to Acer NitroSense Electron DevTools Port
id: 8a4c1d76-3f2b-4e9c-9d51-2c0f6b7e9a10
status: experimental
description: Detects local processes opening a connection to TCP port 9993, the exposed Electron/Chromium DevTools endpoint used by Acer NitroSense.
references:
- https://nvd.nist.gov/vuln/detail/CVE-2026-50228
author: Threat Intelligence
date: 2026/01/01
logsource:
category: network_connection
product: windows
detection:
selection:
DestinationPort: 9993
DestinationIp:
- '127.0.0.1'
- '::1'
condition: selection
falsepositives:
- Legitimate local debugging by developers
level: high
tags:
- attack.execution
- attack.t1203
- cve.2026.50228
YARA Rule
rule CVE_2026_50228_NitroSense_DevTools_Config
{
meta:
description = "Detects configuration artifacts indicating Chromium remote debugging enabled in Acer NitroSense (CVE-2026-50228)"
author = "Threat Intelligence"
reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-50228"
date = "2026-01-01"
severity = "high"
strings:
$s1 = "remote-debugging-port" ascii wide nocase
$s2 = "9993" ascii wide
$s3 = "NitroSense" ascii wide nocase
condition:
($s1 and $s2) or (uint16(0) == 0x5A4D and $s3 and $s1)
}
Suricata IDS Rule
alert tcp $HOME_NET any -> 127.0.0.1 9993 (msg:"CVE-2026-50228 Acer NitroSense Electron DevTools connection attempt"; flow:to_server,established; content:"GET"; http_method; sid:202650228; rev:1; metadata:created_at 2026_01_01, cve CVE-2026-50228; classtype:attempted-user; reference:url,nvd.nist.gov/vuln/detail/CVE-2026-50228;)
Elastic Detection
network where destination.port == 9993 and destination.ip in ("127.0.0.1", "::1") and process.name != null
Splunk SPL Query
index=network_connections OR index=endpoint
| search destination_port=9993 (destination_ip="127.0.0.1" OR destination_ip="::1")
| stats count values(source_process_name) as processes values(user) as users by host destination_ip destination_port
| where count > 0
Wazuh OSSEC Rule
<group name="windows,network,cve_2026_50228,">
<rule id="100228" level="12">
<if_sid>60000</if_sid>
<field name="dstport">9993</field>
<field name="dstip">127.0.0.1</field>
<description>CVE-2026-50228: Possible exploitation of Acer NitroSense exposed Electron DevTools port 9993</description>
<mitre>
<id>T1203</id>
</mitre>
<group>cve_2026_50228,</group>
</rule>
</group>
Mitigation & Patch Guidance
Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source).
Immediate mitigations.
- Restrict or block local access to TCP port 9993 with host firewall rules scoped to loopback where operationally feasible, and monitor for connections to it.
- Where NitroSense is not required, uninstall or disable it to remove the vulnerable component entirely.
- Reduce the privilege level under which NitroSense runs, if configurable, to limit post-exploitation impact.
- Enforce least privilege and application allowlisting so arbitrary local processes cannot freely spawn or attach to privileged Electron applications.
Patch / upgrade steps.
- No patch is available from any tracked source. Monitor Acer's official support channels for a NitroSense update addressing the DevTools exposure and upgrade as soon as a fixed release is published. Verify the fixed version explicitly references removal or authentication-gating of the remote debugging endpoint before treating the issue as resolved.
Long-term hardening.
- Establish vendor software inventory and continuous vulnerability monitoring for preinstalled OEM utilities such as NitroSense.
- Require that production deployments of Electron applications disable Chromium remote debugging.
- Apply network segmentation and EDR coverage on endpoints to detect unusual loopback debugging connections and injection activity.
- Include local privilege-escalation vectors in detection baselines, since this CVE requires an existing local foothold.
References
- NVD — CVE-2026-50228: https://nvd.nist.gov/vuln/detail/CVE-2026-50228
- CWE-489: Active Debug Code — https://cwe.mitre.org/data/definitions/489.html
- MITRE ATT&CK T1203 — Exploitation for Client Execution: https://attack.mitre.org/techniques/T1203/
- Acer NitroSense product support page (check for vendor advisory/update): https://www.acer.com/
- CISA Known Exploited Vulnerabilities catalog (not listed at time of writing): https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Threat actor campaign data: none available. No exploit-in-the-wild evidence, PoC, or Nuclei template is currently associated with CVE-2026-50228.
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