CVE-2026-85058

HIGH 7.5

Moquette: Missing Authorization in io.moquette:moquette-broker

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-862
Vendor	moquette-io
Product	moquette
Published	Sep 18, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

moquette-io / moquette

< 0.18.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/moquette-io/moquette/security/advisories/GHSA-9jjc-fw8x-fmwx github.com: https://github.com/moquette-io/moquette/commit/e23df019f6a11e22c7d2047d4f86d07095466c97 github.com: https://github.com/moquette-io/moquette/commit/f5a323fe782d1505c0097498cb22eb6ec6c96973 github.com: https://github.com/moquette-io/moquette/releases/tag/v0.18.1