# CVE-2026-49186: Acer Connect M6E missing MQTT topic access control

Source: https://junglewise.ai/threats/cve-2026-49186-acer-connect-m6e-missing-mqtt-topic-access-control  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-04. Updated: 2026-06-04  
License: CC BY 4.0 with a link back

CVE-2026-49186 · Severity: info · CVSS 8.6 · Published 2026-06-04

The Acer Connect M6E 5G portable router contains a security flaw in its internal messaging system (MQTT). This vulnerability allows an attacker to bypass intended restrictions to discover hidden network devices or send unauthorized control commands to the router. This could lead to a loss of privacy or unauthorized changes to the device's configuration and operation.

Technologies: [Acer Connect M6E 5G Portable WiFi Router](https://junglewise.ai/threats/technologies/connect-m6e-5g-portable-wifi-router). Vendors: [Acer](https://junglewise.ai/threats/vendors/acer).

## Quick answers

**Is CVE-2026-49186 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-49186 being exploited in the wild.

**How severe is CVE-2026-49186?** Informational severity, with a CVSS score of 8.6, published 4 June 2026.

**Which products and versions are affected?** Acer Connect M6E 5G Portable WiFi Router M6E_AI_1.00.000019 or earlier.

**Is there a fix for CVE-2026-49186?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-49186 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-49186?** Check whether you run Acer Connect M6E 5G Portable WiFi Router at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The local MQTT broker on affected Acer Connect M6E devices does not enforce topic-level Access Control Lists (ACLs). An attacker with network access to the broker can utilize MQTT wildcard characters ('#' or '+') to subscribe to all topics, enabling the enumeration of hidden network devices and the interception of sensitive telemetry. Furthermore, the lack of enforcement allows for the publication of rogue control commands to topics that should be restricted. While the CVSS vector indicates high privileges (PR:H) may be required, the lack of ACL enforcement effectively bypasses intended authorization boundaries for any connected client. Acer is working on a firmware update to enforce ACLs and ban global wildcards for non-administrative roles.

## Affected products

- Acer Connect M6E 5G Portable WiFi Router M6E_AI_1.00.000019 or earlier

## Timeline

- 2026-06-04: advisory: Acer published security advisory and NVD entry created.

## References

- [https://community.acer.com/en/kb/articles/19707](https://community.acer.com/en/kb/articles/19707)

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- [Acer Connect M6E IDOR in account validation endpoint](https://junglewise.ai/threats/cve-2026-50213-acer-connect-m6e-idor-in-account-validation-endpoint)