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Vulnerability record · CVE-2026-85724 · published 23 September 2026

CVE-2026-85724: Moquette incorrect authorization vulnerability

Moquette · Moquette

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.

9.6 CVSS 3.1 Critical EPSS 0.27% · top 82.8% CWE-155 · CWE-155CWE-863 · Incorrect authorization
9.6CVSS 3.1 base score
0.27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
25 Sep 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/moquette-io/moquette/commit/b4a98bb3f3425ece476ed073aa080c627c1239af Patch
https://github.com/moquette-io/moquette/releases/tag/v0.18.1 Release Notes
https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq ExploitMitigationVendor Advisory
https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq ExploitMitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.7CVE-2026-95843Moquette improper input validation vulnerabilityMoquette is a lightweight Java MQTT broker. Prior to 0.18.1, PostOffice.subscribe parses a shared-subscription filter through SharedSubscriptionUtils…EPSS 0.43%8.7CVE-2026-95845Moquette allocation without limits vulnerabilityMoquette is a lightweight Java MQTT broker. Prior to 0.18.1, the broker does not enforce a maximum length for pending per-session message queues. Whe…EPSS 0.36%8.7CVE-2026-95846Moquette missing authorization vulnerabilityMoquette is a lightweight Java MQTT broker. Prior to 0.18.1, PostOffice.publishWill publishes a client's Last-Will message without applying the canWr…EPSS 0.27%8.7CVE-2026-95842Moquette vulnerabilityMoquette is a lightweight Java MQTT broker. Prior to 0.18.1, SessionEventLoop.run catches only InterruptedException, and SessionEventLoopGroup does n…EPSS 0.43%

Source: NIST National Vulnerability Database (record CVE-2026-85724), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.