moquette-io Moquette up to 0.18.0 Last Will PostOffice.publishWill privileges management

Summaryinfo

A vulnerability, which was classified as critical, was found in moquette-io Moquette up to 0.18.0. This vulnerability affects the function PostOffice.publishWill of the component Last Will. Such manipulation leads to privileges management. This vulnerability is documented as CVE-2026-85058. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in moquette-io Moquette up to 0.18.0 and classified as critical. Affected by this issue is the function PostOffice.publishWill of the component Last Will. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-85058 since 09/02/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

Upgrading to version 0.18.1 eliminates this vulnerability.

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Productinfo

Vendor

• moquette-io

Name

• Moquette

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18.0

Website

• Product: https://github.com/moquette-io/moquette/

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