Vulnerability 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 Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/moquette-io/moquette/commit/e23df019f6a11e22c7d2047d4f86d0709
- https://github.com/moquette-io/moquette/commit/f5a323fe782d1505c0097498cb22eb6ec
- https://github.com/moquette-io/moquette/releases/tag/v0.18.1
- https://github.com/moquette-io/moquette/security/advisories/GHSA-9jjc-fw8x-fmwx
FAQ
What is CVE-2026-85058?
CVE-2026-85058 is a vulnerability with a CVSS score of 7.5 (HIGH). 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.canWri...
How severe is CVE-2026-85058?
CVE-2026-85058 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-85058?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.