CVE-2026-40539

State: Published
Severity: 7.1 High
Published: Sep 18, 2026
Updated: Sep 18, 2026
Reserved: Apr 14, 2026

Description

An improper certificate validation vulnerability in Email API in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows man-in-the-middle attackers to read or write arbitrary files and conduct denial-of-service attacks.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H	synology

Weaknesses

CWE-295 Improper Certificate Validation

Affected Products

Product	Versions
DiskStation Manager (DSM)Synology	7.3 to before 7.3.2-86009-2Affected 7.2.2 to before 7.2.2-72806-7Affected 7.2.1 to before 7.2.1-69057-10Affected before 7.2.1Unknown

References

Synology-SA-26:06 DSMvendor-advisory

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