CVE-2026-85724

Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass

State: Published
Severity: 9.6 Critical
Published: Sep 23, 2026
Updated: Sep 24, 2026
Reserved: Sep 4, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	9.6 Critical	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-863 Incorrect Authorization
CWE-155 Improper Neutralization of Wildcards or Matching Symbols

Affected Products

Product	Versions
moquettemoquette-io	< 0.18.1Affected

References

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