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Vulnerability record · CVE-2026-85058 · published 18 September 2026

CVE-2026-85058: Missing authorization vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.45% · top 63.3% CWE-862 · Missing authorization Deferred
7.5CVSS 3.1 base score
0.45%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
24 Sep 2026Last modified by NVD

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.

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

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-85058), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.