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Acer M3WebServer EUVDEUVD-2026-34210

| CVE-2026-49191 CRITICAL
Improper Authentication (CWE-287)
2026-06-04 Acer GHSA-gpg2-45rx-77ff
Authentication Bypass Connect M6E 5G Portable Wifi Router
9.3
CVSS 4.0 · NVD
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Severity by source

NVD PRIMARY
9.3 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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:N/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
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jun 04, 2026 - 07:30 vuln.today
CVSS changed
Jun 04, 2026 - 07:22 NVD
9.3 (CRITICAL)

DescriptionCVE.org

The production build of the M3WebServer hard-codes its backend API keys, which can be easily intercepted through verbose error handling pages.

AnalysisAI

Authentication bypass in the Acer Connect M6E 5G Portable WiFi Router's M3WebServer production build exposes hard-coded backend API keys through verbose error pages, enabling remote unauthenticated attackers to harvest credentials and gain full administrative control over the device. CVSS 4.0 scores this 9.3 (Critical) with no privileges or user interaction required, though no public exploit has been identified at time of analysis.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify exposed M3WebServer interface
Delivery
Send malformed HTTP request to error path
Exploit
Parse verbose error page for hard-coded API keys
Execution
Authenticate to backend API with leaked keys
Impact
Modify router configuration or pivot to LAN clients
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Vulnerability AssessmentAI

Exploitation Exploitation requires only network reachability to the M3WebServer HTTP interface on an Acer Connect M6E 5G router running the production firmware build, plus the ability to trigger one of the verbose error-handling code paths that render the hard-coded backend API keys in the response. … 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:N/UI:N with VC:H/VI:H/VA:H describes a fully remote, low-complexity, zero-prerequisite attack against confidentiality, integrity, and availability of the vulnerable component - consistent with the 9.3 base score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker on the same network segment (or across the internet, if WAN management is enabled) sends malformed or unexpected HTTP requests to the router's M3WebServer until a verbose error page is rendered, then extracts the embedded backend API keys from the response body. Using those keys, the attacker authenticates directly to the backend API to read configuration, alter routing or DNS, pivot into the connected LAN, or brick the device - no credentials, user interaction, or social engineering required.
Remediation Apply the firmware update referenced in Acer's advisory at https://community.acer.com/en/kb/articles/19707 as the primary fix; an exact patched firmware version was not included in the supplied intelligence, so administrators should treat the vendor article as the authoritative source for the specific build number. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

24 hours: Identify and inventory all Acer Connect M6E 5G devices in use across the organization and document their network locations. …

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EUVD-2026-34210 vulnerability details – vuln.today
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