---
title: "CVE-2026-85724: Moquette - Broken Access Control"
description: "Moquette < 0.18.1 contains an authorization bypass caused by improper substitution of client ID and username in pattern-based ACL rules, letting attackers with crafted identities gain cross-tenant read/write access or cause DoS, exploit requires crafted client ID or username."
url: https://panop.io/threat-heartbeat/CVE-2026-85724/
---

# CVE-2026-85724 Moquette - Broken Access Control

Moquette < 0.18.1 contains an authorization bypass caused by improper substitution of client ID and username in pattern-based ACL rules, letting attackers with crafted identities gain cross-tenant read/write access or cause DoS, exploit requires crafted client ID or username.

CVSS base score 9.6 /10

Critical

CISA KEV

Not listed

Public exploit

Proof of concept available

Authentication

Required

EPSS

0.27% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-85724)

## Details

Type

Broken Access Control

Impact

Data Tampering, Denial Of Service

CVSS vector

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

Published

23 September 2026

Updated

15 October 2026

Weakness

[CWE-155](https://cwe.mitre.org/data/definitions/155.html)

## Vendor fix

Update to version 0.18.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-85724](https://nvd.nist.gov/vuln/detail/CVE-2026-85724)
- [https://github.com/moquette-io/moquette/commit/b4a98bb3f3425ece476ed073aa080c627c1239af](https://github.com/moquette-io/moquette/commit/b4a98bb3f3425ece476ed073aa080c627c1239af)
- [https://github.com/moquette-io/moquette/releases/tag/v0.18.1](https://github.com/moquette-io/moquette/releases/tag/v0.18.1)
- [https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq](https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)