Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-85724
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-23 17:17:17 UTC
Updated2026-09-25 13:34:57 UTC
DescriptionMoquette 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.

Risk And Classification

Primary CVSS: v3.1 9.6 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

EPSS: 0.002700000 probability, percentile 0.172390000 (date 2026-09-27)

Problem Types: CWE-155 | CWE-863 | CWE-863 CWE-863: Incorrect Authorization | CWE-155 CWE-155: Improper Neutralization of Wildcards or Matching Symbols

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
3.1CNADECLARED9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Moquette Moquette All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Moquette-io Moquette affected < 0.18.1 Not specified

References

ReferenceSourceLinkTags
github.com/moquette-io/moquette/releases/tag/v0.18.1 [email protected] github.com Release Notes
github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Exploit, Mitigation, Vendor Advisory
github.com/moquette-io/moquette/commit/b4a98bb3f3425ece476ed073aa080c627... [email protected] github.com Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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