---
id: CVE-2026-40538
title: >-
  An improper restriction of excessive authentication attempts vulnerability in
  Auto block in Synology DiskStation Manager (DSM) before 7.2.1-69057-10,
  7.2.2-72806-7 and 7.3.2-86009-2 allows remote attackers to read limited files
  via brute…
summary: >-
  An improper restriction of excessive authentication attempts vulnerability in
  Auto block in Synology DiskStation Manager (DSM) before 7.2.1-69057-10,
  7.2.2-72806-7 and 7.3.2-86009-2 allows remote attackers to read limited files
  via brute…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-307
vendor: Synology
product: DiskStation Manager (DSM)
affected:
  - diskstation_manager_dsm >= 7.3.2 < 7.3.2-86009-2
  - diskstation_manager_dsm >= 7.2.2 < 7.2.2-72806-7
  - diskstation_manager_dsm >= 7.2.1 < 7.2.1-69057-10
published: '2026-09-18'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T19:07:38.320'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-40538'
references:
  - url: 'https://www.synology.com/en-global/security/advisory/Synology_SA_26_06'
    label: security@synology.com
tags:
  - nvd
  - cve.org
epss: 0.00372
epssPercentile: 0.28428
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T10:42:03.617664Z'
ingestedAt: '2026-09-18T08:38:04.109Z'
---

## Overview

An improper restriction of excessive authentication attempts vulnerability in Auto block in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows remote attackers to read limited files via brute-force attacks.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.