CVE-2026-85724

Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass

Published Sep 23, 2026 CVSS 3.1 · 9.6 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-5f42-97gr-vfhq Moquette: Pattern-ACL wildcard injection (cross-tenant authorization bypass) plus a remote-unauthenticated DoS cluster, a Will-message authorization bypass, and a cross-session durable-corruption bug
History
Type Values Removed Values Added
First Time appeared Moquette
Moquette moquette
CPEs cpe:2.3:a:moquette:moquette:*:*:*:*:*:*:*:*
Vendors & Products Moquette
Moquette moquette
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Moquette-io
Moquette-io moquette
Vendors & Products Moquette-io
Moquette-io moquette
Type Values Removed Values Added
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.
Title Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass
Weaknesses CWE-155
CWE-863
References
Metrics cvssV3_1

{'score': 9.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Sep 24, 2026, 2:19 PM
Reserved
Sep 4, 2026, 2:45 PM
Status
Analyzed
Published
Sep 23, 2026, 5:17 PM
Modified
Sep 25, 2026, 1:34 PM