CVE-2026-85724
Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass
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.
INFO
Published Date :
Sept. 23, 2026, 5:17 p.m.
Last Modified :
Sept. 25, 2026, 1:34 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update Moquette to version 0.18.1.
- Apply security patches if available.
- Review and validate ACL rules.
- Restart the broker after updates.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-85724.
| URL | Resource |
|---|---|
| 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 | Exploit Mitigation Vendor Advisory |
| https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-85724 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-85724
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-85724 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-85724 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Sep. 25, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:moquette:moquette:*:*:*:*:*:*:*:* versions up to (excluding) 0.18.1 Added Reference Type GitHub, Inc.: https://github.com/moquette-io/moquette/commit/b4a98bb3f3425ece476ed073aa080c627c1239af Types: Patch Added Reference Type GitHub, Inc.: https://github.com/moquette-io/moquette/releases/tag/v0.18.1 Types: Release Notes Added Reference Type CISA-ADP: https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq Types: Exploit, Mitigation, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq Types: Exploit, Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 24, 2026
Action Type Old Value New Value Added Reference https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq Added SSVC {'id': 'CVE-2026-85724', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-24T14:18:56.863679Z'} -
New CVE Received by [email protected]
Sep. 23, 2026
Action Type Old Value New Value 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N Added CWE CWE-155 Added CWE CWE-863 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/85xxx/CVE-2026-85724.json">CVE-2026-85724</a> Added Reference https://github.com/moquette-io/moquette/commit/b4a98bb3f3425ece476ed073aa080c627c1239af Added Reference https://github.com/moquette-io/moquette/releases/tag/v0.18.1 Added Reference https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq