Improper Restriction of Excessive Authentication Attempts in DiskStation Manager (DSM) - CVE-2026-40538

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Main Vulnerability Database Vulnerabilities #VU126271

Improper Restriction of Excessive Authentication Attempts in DiskStation Manager (DSM) - CVE-2026-40538

Published: April 16, 2026


Vulnerability identifier: #VU126271
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-40538
CWE-ID: CWE-307
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Synology Inc.
Affected software:
DiskStation Manager (DSM)

Detailed vulnerability description

The vulnerability allows a remote attacker to obtain non-sensitive information.

The vulnerability exists due to improper restriction of excessive authentication attempts in DSM when handling authentication attempts. A remote attacker can perform repeated authentication attempts to obtain non-sensitive information.


How to mitigate CVE-2026-40538

Install security update from vendor's website.

Sources