CVE Explorer
CVE-2026-33356
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.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"IoT Cloud MQTT Broker EMQX","vendor":"Meari","versions":[{"status":"affected","version":"4.x","versionType":"custom"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:468db0496d8821be12bdd2aed60abd20c0708aaf7d021b94dcdacda141715971 · sha256:5f73f1dfbc30c9ca… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.7,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:468db0496d8821be12bdd2aed60abd20c0708aaf7d021b94dcdacda141715971 · sha256:5f73f1dfbc30c9ca… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-639","description":"CWE-639 Authorization Bypass Through User-Controlled Key","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:468db0496d8821be12bdd2aed60abd20c0708aaf7d021b94dcdacda141715971 · sha256:5f73f1dfbc30c9ca… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"tags":["technical-description"],"url":"https://github.com/xn0tsa/nobody-puts-baby-in-a-corner"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:468db0496d8821be12bdd2aed60abd20c0708aaf7d021b94dcdacda141715971 · sha256:5f73f1dfbc30c9ca… · /containers/cna/references/0
{"tags":["third-party-advisory"],"url":"https://www.runzero.com/advisories/meari-mqtt-broker-missing-per-device-subscribe-acl-cve-2026-33356/"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:468db0496d8821be12bdd2aed60abd20c0708aaf7d021b94dcdacda141715971 · sha256:5f73f1dfbc30c9ca… · /containers/cna/references/1
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.