# CVE-2026-49186: Lack of MQTT Broker Topic Access Control Lists

> Attackers can subscribe to all topics to enumerate devices or publish rogue commands due to missing MQTT topic access controls.

- **Severity:** High 8.6 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Jun 2026
- **Updated:** 4 Jun 2026
- **Also known as:** GHSA-vvpf-h42q-v96v

## What is CVE-2026-49186?

CVE-2026-49186 is a high-severity missing authorization vulnerability in Acer Connect M6E 5G Portable WiFi Router, published on 4 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

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.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-49186?

It affects 1 product.


Products: Acer Connect M6e 5g Firmware.

## How do I fix CVE-2026-49186?

No fix has been published for CVE-2026-49186 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-49186 being exploited?

There is no known exploitation of CVE-2026-49186 in the wild and no public exploit code.

## Other vulnerabilities in Acer Connect M6E 5G Portable WiFi Router

- [CVE-2026-49185](https://insights.sbomify.com/CVE-2026-49185/): Instruction Injection via FieldX MDM (critical 10.0)
- [CVE-2026-49190](https://insights.sbomify.com/CVE-2026-49190/): Missing Per-Instruction Authorization Checks (critical 9.4)
- [CVE-2026-49194](https://insights.sbomify.com/CVE-2026-49194/): SCREEN_CLICK Authentication Bypass (critical 9.4)
- [CVE-2026-49191](https://insights.sbomify.com/CVE-2026-49191/): Exposed Hard-coded M3WebServer Backend API Key (critical 9.3)
- [CVE-2026-50209](https://insights.sbomify.com/CVE-2026-50209/): MDM Server Registration Overriding (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-49186 and fix it if it is affected.

What it is: CVE-2026-49186 is a high-severity missing authorization vulnerability in Acer Connect M6E 5G Portable WiFi Router, published on 4 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-49186 in the wild and no public exploit code.

Affected product: Acer Connect M6E 5G Portable WiFi Router. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-49186/ (Markdown: https://insights.sbomify.com/CVE-2026-49186/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-49186
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-49186
- OSV: https://osv.dev/vulnerability/CVE-2026-49186

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-49186/
Summaries are generated and may contain mistakes; the official description above is the record.