CVE-2026-50607

Executive Summary

CVE-2026-50607 is an exposure-of-resource-to-wrong-sphere vulnerability (CWE-668) in the Acer System Monitoring component shipped with Acer NitroSense and PredatorSense utilities. The component runs a WebSocket service bound to all network interfaces rather than to the loopback interface, making it reachable from the adjacent network (LAN, shared Wi-Fi, guest VLAN, or any routed segment permitted by host firewall policy) instead of being confined to local-only access. Impact is bounded by the fact that the exposed service is a monitoring/telemetry endpoint rather than a directly authenticated remote-code-execution service, but the wide default install base on consumer and gaming laptops — frequently used on untrusted networks — creates meaningful adjacent-network attack surface.

Technical Analysis

The core defect is a network binding misconfiguration. Acer System Monitoring, a helper component bundled with the NitroSense and PredatorSense system-tuning utilities, exposes a WebSocket service whose listener was configured to bind to all interfaces (i.e., the wildcard/any-address binding, typically 0.0.0.0 or ::) rather than to a loopback-only address (127.0.0.1/::1). Per the NVD description, this "may expose the service to unintended network access."

WebSocket (RFC 6455) is an application-layer protocol that begins with an HTTP Upgrade handshake and then maintains a persistent, full-duplex frame channel over a single TCP connection. Because the handshake is standard HTTP, any host able to reach the listening port can negotiate a session, subject only to whatever authentication, origin-checking, or token validation the service implements. The vulnerability class here is incorrectly scoped network exposure, not a memory-safety flaw, not an injection flaw, and not an authentication bypass per se. What the misbinding does is remove the network perimeter that previously served as the sole access-control boundary: services designed on the assumption that only local processes could connect frequently rely on that assumption instead of enforcing authentication.

CWE-668 ("Exposure of Resource to Wrong Sphere") is the correct classification. The "resource" is the monitoring WebSocket endpoint; the "wrong sphere" is the adjacent network. The vulnerability does not require user interaction (UI:N) and is exploitable over an adjacent-network vector (AV:A), which is how the CVSS vector above is composed. Because the NVD record supplies no CVSS score, EPSS score, CWE-adjacent technical detail beyond the binding statement, no affected-firmware version map, and no vendor advisory, the depth of any code-level analysis is strictly bounded by the disclosure text. No function names, class names, endpoints, or parameter names are provided in the CNA/NVD data, and none are asserted here.

Two secondary weaknesses are commonly co-located with this primary flaw, and both are plausible aggravating factors without being asserted as present in this specific product:

1. Absence or weakness of authentication on the WebSocket upgrade. If the service was designed for loopback-only reachability, it may perform no authentication at all, treating "local process" as implicit authorization.
2. Absence of Origin header enforcement. WebSocket servers that do not validate the Origin header are reachable from malicious web content executed in a browser on the same LAN, enabling cross-site WebSocket hijacking (CSWSH). This is a class-level risk associated with unauthenticated WebSocket listeners, not a disclosed detail of this CVE.

Operationally, the affected service runs on machines where NitroSense or PredatorSense is installed. These are Acer consumer/gaming laptops (Nitro and Predator lines). Because the service is a persistent background component, exposure persists for the lifetime of the system session, including when the laptop is carried onto hotel Wi-Fi, conference networks, university networks, or co-working spaces.

Exploitation Scenarios

No public proof-of-concept, Metasploit module, Nuclei template, or exploit code is known for CVE-2026-50607, and the vendor has not published a fix. The chain below is described at the vulnerability-class level, strictly bounded by the disclosure text.

1. Reconnaissance / target identification. An adversary positioned on the same broadcast domain or any routed segment permitted by the target's host firewall scans for the listening port associated with the Acer System Monitoring WebSocket service. Discovery can proceed via port sweep (any service port the component ships with), via mDNS/SSDP noise emitted by the host, or passively by observing the WebSocket HTTP Upgrade: websocket handshake in cleartext traffic. On untrusted shared networks (hotel, conference, café, dormitory), this is opportunistic and requires no prior knowledge of the victim.

2. Trigger of the flaw class. The adversary completes an HTTP Upgrade handshake to the WebSocket endpoint. Because the listener binds to all interfaces, the connection is accepted; the host firewall default — which on many consumer Windows installs does not block an application that registered a listener — is the only remaining control. Where the service performs no authentication, no origin validation, or validates a weak/static token, the session is established. This step is the entire "exploitation" of the network-exposure defect: reaching a service that was intended to be unreachable.

3. Interaction / payload method. Once a WebSocket session is established, the adversary can send and receive frames understood by the monitoring component's protocol. At the vulnerability-class level, the consequences depend on what the endpoint's message handlers permit — for example, reading system telemetry, invoking state-changing monitoring commands, or using the endpoint as an unauthenticated pivot surface for any message handler that trusts the caller. No specific message types, commands, or API parameters can be named because the NVD record does not disclose them. Any statement of exact impact beyond "unintended network access to the service" would be speculation.

4. Post-exploitation impact. The immediate consequence is unauthorized adjacent-network interaction with a service that was intended to be local-only. Secondary consequences — lateral movement to the host, manipulation of system-monitoring/fan/thermal control state, or credential/session theft — are possible only insofar as the underlying message handlers permit them and are not established by this disclosure. The realistic, defensible framing is: the flaw converts a local-only trust boundary into a network-reachable one, and the blast radius equals whatever the exposed service can be made to do by an unauthenticated (or weakly authenticated) remote peer.

There is no evidence of exploitation in the wild (CISA KEV: NO; no exploit code; no EPSS score published). Treat this as a latent exposure risk requiring validation rather than an active campaign.

Impact Assessment

Business impact is concentrated in endpoint-management and BYOD contexts. Affected systems are Acer Nitro and Predator laptops — a large consumer and prosumer install base that frequently connects to untrusted networks but is less often covered by enterprise EDR or hardened host-firewall baselines than corporate-managed hardware. Where such devices are permitted on corporate Wi-Fi or VLANs, the exposed listener sits inside the perimeter.

The CVSS vector used here — CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N — reflects the following subscores:

• AV:A (Adjacent Network): the attacker must be on the same layer-2 domain or an adjacent, reachable segment; not exploitable from the public internet directly.
• AC:L (Low): no special conditions, race windows, or complex preconditions; connecting to an open port is trivial.
• PR:N (None): no credentials are asserted as required by the disclosure.
• UI:N (None): no victim interaction.
• S:U (Unchanged): no evidence of cross-security-authority impact from the disclosure alone.
• C:L / I:L: partial confidentiality and integrity impact is plausible given a monitoring service, but the exact authority of message handlers is undisclosed.
• A:N: no availability impact is established by the disclosure.

Note: this vector is an analytic construction derived from the AV:A exposure and the CWE-668 classification, since NVD publishes no score for this record. It should be treated as a working assessment, not a vendor or NVD figure.

Blast radius at the endpoint is high (all hosts with NitroSense/PredatorSense installed are potentially affected), while per-host severity is bounded by the service's functional authority. Fleet-level risk is materially higher for organizations that permit gaming laptops or student/unmanaged devices on production segments.

Detection Guidance

Detection strategy has two components: (a) identify hosts with a network-exposed Acer System Monitoring listener, and (b) detect WebSocket handshakes and frame traffic to that listener from non-loopback peers.

Sigma Rule

title: Acer System Monitoring WebSocket Bound to All Interfaces (CVE-2026-50607)
id: 8f0c1b24-5b7a-4e21-9c3d-0f2a7d9b4c11
status: experimental
description: Detects processes binding a network listener on a non-loopback address.
    In the context of CVE-2026-50607, the Acer System Monitoring WebSocket service
    shipped with NitroSense/PredatorSense listens on all interfaces, exposing it
    to the adjacent network.
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2026-50607
author: valtersit.com Threat Intelligence
date: 2026/01/01
tags:
    - attack.t1210
    - cve.2026-50607
logsource:
    category: network_connection
    product: windows
detection:
    selection_listen:
        Initiated: 'false'
        DestinationIp:
            - '0.0.0.0'
            - '::'
    selection_proc:
        Image|endswith:
            - '\AcerSystemMonitoring.exe'
            - '\NitroSense.exe'
            - '\PredatorSense.exe'
    condition: selection_listen or selection_proc
fields:
    - Image
    - DestinationIp
    - DestinationPort
    - User
falsepositives:
    - Legitimate Acer components transiently binding during startup
level: medium

Adjust Image values to the exact executable names observed in the environment; the disclosure does not name specific binaries.

YARA Rule

rule CVE_2026_50607_Acer_System_Monitoring_All_Interface_Bind
{
    meta:
        author = "valtersit.com Threat Intelligence"
        description = "Heuristic detection for Acer System Monitoring components binding a WebSocket listener to all interfaces (CVE-2026-50607). Class-level, not byte-exact."
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-50607"
        date = "2026-01-01"
        cve = "CVE-2026-50607"
        cwe = "CWE-668"

    strings:
        $p1 = "Acer System Monitoring" ascii wide nocase
        $p2 = "NitroSense" ascii wide nocase
        $p3 = "PredatorSense" ascii wide nocase
        $ws = "websocket" ascii nocase
        $bind = "0.0.0.0" ascii wide
        $bind2 = "::" ascii wide
        $upgrade = "Upgrade: websocket" ascii wide nocase

    condition:
        (any of ($p1, $p2, $p3)) and $ws and 1 of ($bind, $bind2)
        or
        (any of ($p1, $p2, $p3)) and $upgrade
}

Suricata IDS Rule

alert tcp $HOME_NET any -> $HOME_NET any ( \
  msg:"CVE-2026-50607 Possible Acer System Monitoring WebSocket Exposure - Non-Local Upgrade"; \
  flow:established,to_server; \
  content:"Upgrade: websocket"; nocase; http_header; \
  content:"Sec-WebSocket-Key"; nocase; http_header; \
  pkt_data; threshold:type limit, track by_src, count 1, seconds 60; \
  classtype:attempted-recon; \
  reference:cve,2026-50607; \
  reference:url,nvd.nist.gov/vuln/detail/CVE-2026-50607; \
  sid:9000607; rev:1; )

This rule fires on HTTP Upgrade handshakes observed on the wire. It cannot, by itself, distinguish the Acer service from other WebSocket servers; couple it with port inventory or asset data.

Elastic Detection

network where process.name : ("AcerSystemMonitoring.exe", "NitroSense.exe", "PredatorSense.exe")
  and destination.ip != "127.0.0.1"
  and destination.ip != "::1"
  and not cidr_match(destination.ip, "10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16", "169.254.0.0/16")
  and destination.port != 0

Widened variant: flag Acer monitoring processes establishing or accepting sessions to any non-loopback address, and separately alert on inbound SYN/ACK to the service port from non-RFC1918 sources.

Splunk SPL Query

index=network_connections (dest_ip="0.0.0.0" OR dest_ip="::")
  OR (process_name IN ("AcerSystemMonitoring.exe","NitroSense.exe","PredatorSense.exe"))
| eval is_listener = if(dest_ip="0.0.0.0" OR dest_ip="::", 1, 0)
| stats count min(_time) as first_seen max(_time) as last_seen
    by host, process_name, dest_ip, dest_port, is_listener
| where is_listener=1 OR (match(process_name, "(?i)Acer|NitroSense|PredatorSense") AND dest_port!=0)
| convert ctime(first_seen) ctime(last_seen)
| table host, process_name, dest_ip, dest_port, count, first_seen, last_seen

For web-proxy or Zeek logs, replace with a http sourcetype query filtering on method="GET", http_user_agent containing a WebSocket client signature, and internal dest_ip values, then summarize by src_ip.

Wazuh OSSEC Rule

<group name="windows,acer,cve-2026-50607,">
  <rule id="100607" level="10">
    <if_sid>61603</if_sid>
    <field name="win.eventdata.image">(?i)AcerSystemMonitoring\.exe|NitroSense\.exe|PredatorSense\.exe</field>
    <description>CVE-2026-50607: Acer System Monitoring component activity detected - verify WebSocket listener is not bound to all interfaces</description>
    <mitre>
      <id>T1210</id>
    </mitre>
    <group>cve_2026_50607,network_exposure,</group>
  </rule>

  <rule id="100608" level="12">
    <if_sid>100607</if_sid>
    <field name="win.eventdata.destinationIp">^0\.0\.0\.0$|^::$</field>
    <description>CVE-2026-50607: Acer System Monitoring WebSocket appears bound to all interfaces (wildcard bind)</description>
    <mitre>
      <id>T1210</id>
    </mitre>
  </rule>
</group>

Parent rule ID 61603 corresponds to Windows Sysmon network-connection events in a stock Wazuh ruleset; validate against your ruleset version before deployment.

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source). No vendor fix, advisory, or workaround is available for CVE-2026-50607 as of this writing. The mitigations below are defensive, compensating controls.

1. Immediate mitigations.

• Block the port at the host firewall. Identify the TCP port bound by the Acer System Monitoring service (enumerate with netstat -ano or Get-NetTCPConnection and correlate with the owning PID), then create an inbound Windows Defender Firewall rule denying traffic to that port from any non-loopback source. This directly negates the misbinding.
• Isolate affected devices onto untrusted or restricted VLANs. Do not place Nitro/Predator laptops on internal corporate segments or any VLAN that can reach management infrastructure.
• Disable the component if not required. Where the system-monitoring/tuning features are not needed, stop and disable the parent service/process so the listener is not instantiated.
• Enforce client isolation on wireless networks to eliminate the adjacent-network vector for guest/BYOD SSIDs.

2. Patch / upgrade steps.

• Monitor the Acer support sites for NitroSense and PredatorSense for firmware/utility updates; verify the published changelog confirms the listener has been restricted to loopback before removing compensating controls.
• Where Acer releases a fixed release, deploy via the vendor updater and confirm the change with a post-update netstat/Get-NetTCPConnection check — do not assume the update altered the bind without verifying.
• Because no fixed version is identified, record the current utility version on each asset so an upgrade can be mapped cleanly once Acer publishes one.

3. Long-term hardening.

• Add "no application network listener bound to all interfaces unless explicitly approved" to endpoint baselining and configuration-drift monitoring.
• Require MDM/EDR policy for any non-corporate hardware connecting to production networks, including consumer gaming laptops.
• Track CVE-2026-50607 and this CVE class (CWE-668) in vulnerability-management tooling; since no EPSS score exists yet, prioritize by asset exposure (hosts on untrusted networks) rather than by score.
• Harden WebSocket services generally: enforce authentication and Origin validation, and default all management/monitoring listeners to loopback-only.

References

• NVD — CVE-2026-50607: https://nvd.nist.gov/vuln/detail/CVE-2026-50607
• MITRE CWE-668 — Exposure of Resource to Wrong Sphere: https://cwe.mitre.org/data/definitions/668.html
• MITRE ATT&CK T1210 — Exploitation of Remote Services: https://attack.mitre.org/techniques/T1210/
• RFC 6455 — The WebSocket Protocol: https://www.rfc-editor.org/rfc/rfc6455
• Acer product support (NitroSense and PredatorSense utility downloads; check for advisory/update status): https://www.acer.com/us-en/support

Threat actor / exploit-in-the-wild status: None. CVE-2026-50607 is not listed in CISA KEV, has no known public PoC, no Nuclei template, and no exploit code in circulation as of this writing. No associated threat-actor campaigns have been reported. Treat this as a latent adjacent-network exposure risk requiring validation and compensating controls pending a vendor fix.