What is CVE-2026-40538?

CVE-2026-40538 is a low-severity vulnerability in Synology Diskstation Manager (Dsm), classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 3.7/10. Published 2026-09-18.

How severe is CVE-2026-40538?

Low severity. CVSS v3 base score is 3.7 out of 10.

Vulnerability in Synology Diskstation Manager (Dsm)

CVE-2026-40538

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.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Synology Diskstation Manager (Dsm)

Weakness classification (CWE)

CWE-307 — Improper Restriction of Excessive Authentication Attempts

References

security@synology.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-40538?: CVE-2026-40538 is a low-severity vulnerability in Synology Diskstation Manager (Dsm), classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 3.7/10. Published 2026-09-18.
How severe is CVE-2026-40538?: Low severity. CVSS v3 base score is 3.7 out of 10.