Auth bypass in Moquette-Io Moquette
CVE-2026-85724
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Moquette-Io Moquette — versions < 0.18.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-85724?
- CVE-2026-85724 is a critical-severity vulnerability in Moquette-Io Moquette, classified under CWE-155. CVSS score: 9.6/10. Published 2026-09-23.
- How severe is CVE-2026-85724?
- Critical severity. CVSS v3 base score is 9.6 out of 10.