Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, PostOffice.publishWill publishes a client-controlled Last Will message through publish2Subscribers without invoking the authorizator.canWrite check used by normal PUBLISH paths. When anonymous access is enabled and topic ACLs restrict writes, a remote client can set an ACL-protected topic as the Last Will Topic during CONNECT and perform an abnormal client disconnect, causing the broker to inject attacker-controlled messages into a topic for which the client lacks write permission. This issue is fixed in version 0.18.1.
History

Thu, 24 Sep 2026 04:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 21 Sep 2026 10:45:00 +0000

Type Values Removed Values Added
First Time appeared Moquette-io
Moquette-io moquette
Vendors & Products Moquette-io
Moquette-io moquette

Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Description Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, PostOffice.publishWill publishes a client-controlled Last Will message through publish2Subscribers without invoking the authorizator.canWrite check used by normal PUBLISH paths. When anonymous access is enabled and topic ACLs restrict writes, a remote client can set an ACL-protected topic as the Last Will Topic during CONNECT and perform an abnormal client disconnect, causing the broker to inject attacker-controlled messages into a topic for which the client lacks write permission. This issue is fixed in version 0.18.1.
Title Moquette: Missing Authorization in io.moquette:moquette-broker
Weaknesses CWE-862
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-09-18T17:40:39.113Z

Updated: 2026-09-22T15:14:00.736Z

Reserved: 2026-09-02T21:21:01.774Z

Link: CVE-2026-85058

cve-icon Vulnrichment

Updated: 2026-09-22T15:13:47.795Z

cve-icon NVD

Status : Deferred

Published: 2026-09-18T18:17:17.447

Modified: 2026-09-24T21:25:27.050

Link: CVE-2026-85058

cve-icon Redhat

No data.