CVE-2026-33356
Meari MQTT broker missing per-device subscribe ACL
Description
In Meari IoT Cloud MQTT Broker deployments running EMQX 4.x, any authenticated low-privilege account can subscribe to global wildcard topics and receive telemetry from devices the user does not own. The broker enforces publish restrictions but does not enforce equivalent subscribe authorization at per-device scope.
INFO
Published Date :
May 11, 2026, 5:16 p.m.
Last Modified :
May 11, 2026, 5:16 p.m.
Remotely Exploit :
Yes !
Source :
44488dab-36db-4358-99f9-bc116477f914
Affected Products
The following products are affected by CVE-2026-33356
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 44488dab-36db-4358-99f9-bc116477f914 |
Solution
- Implement per-device scope authorization checks for subscriptions.
- Restrict access to telemetry topics for unauthorized users.
- Apply the latest security patches for EMQX broker.
- Review and harden broker access control configurations.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33356.
| URL | Resource |
|---|---|
| https://github.com/xn0tsa/nobody-puts-baby-in-a-corner | |
| https://www.runzero.com/advisories/meari-mqtt-broker-missing-per-device-subscribe-acl-cve-2026-33356/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33356 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33356
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33356 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-33356 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 44488dab-36db-4358-99f9-bc116477f914
May. 11, 2026
Action Type Old Value New Value Added Description In Meari IoT Cloud MQTT Broker deployments running EMQX 4.x, any authenticated low-privilege account can subscribe to global wildcard topics and receive telemetry from devices the user does not own. The broker enforces publish restrictions but does not enforce equivalent subscribe authorization at per-device scope. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N Added CWE CWE-639 Added Reference https://github.com/xn0tsa/nobody-puts-baby-in-a-corner Added Reference https://www.runzero.com/advisories/meari-mqtt-broker-missing-per-device-subscribe-acl-cve-2026-33356/