CVE-2026-40539

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.

Score

CVSS 3.1 7.1 High

Status

Awaiting Analysis - security@synology.com

Published

2026-09-18

Last modified

2026-09-18

Weaknesses

CWE-295

Affected products

• Diskstation Manager Dsm (Synology)

References

• https://www.synology.com/en-global/security/advisory/Synology_SA_26_06