# CVE-2026-49199: Acer Connect W6x command injection in MQTT broker

Source: https://junglewise.ai/threats/cve-2026-49199-acer-connect-w6x-command-injection-in-mqtt-broker  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-29. Updated: 2026-05-29  
License: CC BY 4.0 with a link back

CVE-2026-49199 · Severity: info · CVSS 10 · Published 2026-05-29

The Acer Connect W6x router contains a critical security flaw in how it processes internal messaging. An attacker can send specially crafted messages to the device to take complete control with root-level privileges. This could allow an unauthorized user to intercept internet traffic, access connected devices, or disable the network entirely.

Technologies: [Acer Connect W6x Router](https://junglewise.ai/threats/technologies/connect-w6x-router). Vendors: [Acer](https://junglewise.ai/threats/vendors/acer).

## Quick answers

**Is CVE-2026-49199 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-49199 being exploited in the wild.

**How severe is CVE-2026-49199?** Informational severity, with a CVSS score of 10, published 29 May 2026.

**Which products and versions are affected?** Acer Connect W6x Router W6x_GBL_2.00.000005 and earlier.

**Is there a fix for CVE-2026-49199?** 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-2026-49199 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-49199?** Check whether you run Acer Connect W6x 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

A command injection vulnerability (CWE-77) exists in the MQTT broker processing logic of the Acer Connect W6x router. The flaw is caused by a lack of application-level payload sanitization for incoming messaging strings. An unauthenticated attacker can exploit this by sending crafted MQTT messages to the device, leading to arbitrary code execution with root-level permissions. This vulnerability is addressed in firmware version W6x_GBL_2.00.000008 and later.

## Affected products

- Acer Connect W6x Router W6x_GBL_2.00.000005 and earlier

## Timeline

- 2026-05-29: disclosed
- 2026-05-29: advisory: Acer published security advisory 19672

## References

- [https://community.acer.com/en/kb/articles/19672](https://community.acer.com/en/kb/articles/19672)

## Related threats

- [Acer Connect W6x improper access control in MQTT broker](https://junglewise.ai/threats/cve-2026-49198-acer-connect-w6x-improper-access-control-in-mqtt-broker)
- [Acer Connect W6x Router authentication bypass in app endpoints](https://junglewise.ai/threats/cve-2026-49197-acer-connect-w6x-router-authentication-bypass-in-app-endpoints)
- [Acer Connect W6x command injection in Wi-Fi device blocking feature](https://junglewise.ai/threats/cve-2026-49196-acer-connect-w6x-command-injection-in-wi-fi-device-blocking)
- [Acer Connect W6x unauthenticated debug service in mtk_dut](https://junglewise.ai/threats/cve-2026-49195-acer-connect-w6x-unauthenticated-debug-service-in-mtk-dut)