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Acer Connect M6E CVE-2026-49186

| EUVDEUVD-2026-34200 HIGH
Improper Authentication (CWE-287)
2026-06-04 Acer GHSA-vvpf-h42q-v96v
Authentication Bypass Connect M6E 5G Portable Wifi Router
8.6
CVSS 4.0 · NVD
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Severity by source

NVD PRIMARY
8.6 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

3
Analysis Generated
Jun 04, 2026 - 06:15 vuln.today
CVSS changed
Jun 04, 2026 - 04:22 NVD
8.6 (HIGH)
CVE Published
Jun 04, 2026 - 03:36 nvd
UNKNOWN (no severity yet)

DescriptionCVE.org

The local MQTT broker does not enforce topic-level Access Control Lists (ACLs). This allows any client to subscribe using wildcard characters ( # or +) to enumerate hidden network devices or publish rogue control commands.

AnalysisAI

Authentication bypass on the local MQTT broker of the Acer Connect M6E 5G Portable WiFi Router (firmware M6E_AI_1.00.000019 and earlier) allows any connected client to subscribe with wildcard topics (# or +) and either enumerate hidden network devices or publish rogue control commands. CVSS 4.0 rates this 8.6 (High) with network attack vector and high confidentiality/integrity/availability impact; no public exploit identified at time of analysis and the issue is not in CISA KEV.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Join router's Wi-Fi network
Delivery
Discover local MQTT broker port
Exploit
Connect to broker without ACL check
Install
Subscribe with wildcard topic #
C2
Enumerate devices and capture control traffic
Execute
Publish rogue control commands
Impact
Manipulate router or attached devices
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Vulnerability AssessmentAI

Exploitation The attacker must be able to reach the local MQTT broker on the Acer Connect M6E 5G Portable WiFi Router - in practice this means being associated with the router's Wi-Fi network (or any LAN segment where the broker port is reachable). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N, VC:H/VI:H/VA:H, SC:N/SI:N/SA:N) describes a network-reachable, low-complexity attack with no user interaction but requiring high privileges, and impact contained to the vulnerable component. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker joins the M6E's Wi-Fi (e.g. as a guest, or after obtaining the PSK), connects to the local MQTT broker, and issues a wildcard subscription such as 'SUBSCRIBE #' to enumerate every connected device, sensor reading, and control topic on the router's internal bus. …
Remediation No vendor-released patch version is identified in the available data; the only reference is the Acer community knowledge-base article at https://community.acer.com/en/kb/articles/19707, which should be consulted for the latest firmware bulletin and applied as soon as Acer ships a build later than M6E_AI_1.00.000019. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all Acer Connect M6E 5G routers in your environment and verify firmware version M6E_AI_1.00.000019 or earlier; restrict network access to the router to authorized clients only. …

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CVE-2026-49186 vulnerability details – vuln.today
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