{"id":"CVE-2026-33356","state":"PUBLISHED","title":"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.","publishedAt":"2026-05-11T16:02:14.046Z","updatedAt":"2026-05-11T18:18:45.410Z","severity":{"score":7.7,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","source":"runZero"},"assigner":"runZero","products":["Meari IoT Cloud MQTT Broker EMQX"],"affected":[{"vendor":"Meari","product":"IoT Cloud MQTT Broker EMQX","defaultStatus":"unaffected","versions":[{"version":"4.x","status":"affected","versionType":"custom"}]}],"references":["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/"],"weaknesses":["CWE-639"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/33xxx/CVE-2026-33356.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-33356","state":"PUBLISHED","datePublished":"2026-05-11T16:02:14.046Z","dateUpdated":"2026-05-11T18:18:45.410Z","assignerShortName":"runZero","assignerOrgId":"44488dab-36db-4358-99f9-bc116477f914","dateReserved":"2026-03-19T00:27:05.986Z"},"containers":{"cna":{"title":"Meari MQTT broker missing per-device subscribe ACL","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Meari","product":"IoT Cloud MQTT Broker EMQX","defaultStatus":"unaffected","versions":[{"version":"4.x","status":"affected","versionType":"custom"}]}],"references":[{"url":"https://github.com/xn0tsa/nobody-puts-baby-in-a-corner","tags":["technical-description"]},{"url":"https://www.runzero.com/advisories/meari-mqtt-broker-missing-per-device-subscribe-acl-cve-2026-33356/","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE","baseSeverity":"HIGH","baseScore":7.7,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-639","lang":"en","description":"CWE-639 Authorization Bypass Through User-Controlled Key","type":"CWE"}]}],"providerMetadata":{"shortName":"runZero","orgId":"44488dab-36db-4358-99f9-bc116477f914","dateUpdated":"2026-05-11T16:02:14.046Z"},"datePublic":"2026-05-11T16:00:00.000Z","credits":[{"lang":"en","value":"Sammy Azdoufal","type":"finder"},{"lang":"en","value":"Tod Beardsley of runZero, Inc.","type":"coordinator"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.2"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-11T18:18:36.704517Z","id":"CVE-2026-33356","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-11T18:18:45.410Z"}}]}}}