---
id: CVE-2025-62723
title: 'FlashMQ is a MQTT broker/server, designed for multi-CPU environments'
summary: >-
  FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to
  version 1.23.2, any authenticated user can create sessions and have them
  collect QoS messages. When not sent to a client, these are then not released
  upon (ev…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-772
vendor: flashmq
product: flashmq
affected:
  - flashmq < 1.23.2
patched:
  - flashmq 1.23.2
published: '2025-10-24'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T11:10:00.250'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-62723'
references:
  - url: >-
      https://github.com/halfgaar/FlashMQ/commit/e86c49360ef4387440c97f591770cdb9284b4ee9
    label: security-advisories@github.com
  - url: 'https://github.com/halfgaar/FlashMQ/issues/154'
    label: security-advisories@github.com
  - url: >-
      https://github.com/halfgaar/FlashMQ/security/advisories/GHSA-7mhp-22q4-r6vv
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00341
epssPercentile: 0.2545
ingestedAt: '2026-10-08T11:31:27.576Z'
---

## Overview

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.23.2, any authenticated user can create sessions and have them collect QoS messages. When not sent to a client, these are then not released upon (eventual) session expiration. Version 1.23.2 fixes the issue.

## Affected

- `flashmq < 1.23.2`

## Remediation

Upgrade past the affected range:

- `flashmq 1.23.2`