CVE-2026-85724: Moquette

Critical severity, CVSS 9.6. EPSS: 0.3% chance of exploitation in the next 30 days.

Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, when pattern-based ACL rules are configured, AuthorizationsCollector.canDoOperation substitutes client ID and username values directly into rules containing %c or %u and then treats the result as an MQTT topic filter. A client that uses + or # in either identity can broaden the substituted filter and gain cross-tenant read and write access. A # identity can also produce an invalid filter that triggers a NullPointerException in Topic.match and disrupts session processing. This issue is fixed in version 0.18.1.

Affected products

• Moquette Moquette: before 0.18.1 (fixed in 0.18.1)

Published 2026-09-23. Last modified 2026-09-25.