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CVE-2026-85724— Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass

Quick assessment

Affected
moquette-io moquette
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 9.6 · Critical
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I. Basic Information for CVE-2026-85724

Vulnerability Information

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Vulnerability Title
Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
moquette-io moquette < 0.18.1 -

II. Public POCs for CVE-2026-85724

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III. Intelligence Information for CVE-2026-85724

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Patches & Fixes for CVE-2026-85724 (1)

Other References for CVE-2026-85724 (2)

Same Patch Batch · moquette-io · 2026-09-23 · 8 CVEs total

CVE-2026-95848 9.3 CRITICAL Moquette fails open when configured authentication or authorization classes cannot load
CVE-2026-95847 8.8 HIGH Moquette client IDs can cause cross-session H2 durable-queue corruption
CVE-2026-95846 8.7 HIGH Moquette publishes Last-Will messages without enforcing write authorization
CVE-2026-95843 8.7 HIGH Moquette malformed shared subscriptions can crash command processing
CVE-2026-95845 8.7 HIGH Moquette unbounded per-session message queues allow memory exhaustion
CVE-2026-95842 8.7 HIGH Moquette uncaught MQTT command exceptions can terminate shared session event loops
CVE-2026-95844 8.7 HIGH Moquette deeply nested MQTT topics can cause stack exhaustion

IV. Related Vulnerabilities

Same product: moquette
Same vendor: moquette-io
Same weakness: CWE-863

V. Comments for CVE-2026-85724

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