CVE-2026-40539

HIGHCVSS 7.1

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.

Timeline

Published:September 18th, 2026 9:16 AM

Last modified:September 18th, 2026 7:07 PM

CVSS Scoring

CVSS v3: 7.1 (HIGH)

CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Weaknesses (CWE)

CWE-295

References & Reports

Advisories, patches, and third-party reports

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

Source: NIST NVD · Data may lag official sources by up to one minute