CVE-2026-40538 PUBLISHED

Assigner: synology
Reserved: 14.04.2026 Published: 18.09.2026 Updated: 18.09.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS Score: 3.7

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Synology
Product	DiskStation Manager (DSM)
Versions	Default: affected affected from 7.3.2 to 7.3.2-86009-2 (excl.) affected from 7.2.2 to 7.2.2-72806-7 (excl.) affected from 7.2.1 to 7.2.1-69057-10 (excl.) unknown from 0 to 7.2.1 (excl.)

Credits

Andreas Rothenbacher (error401.de) finder

References

Synology-SA-26:06 DSM

Problem Types

Improper Restriction of Excessive Authentication Attempts CWE