OCTOBER 12, 2026
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Case File

CVE-2026-40539

HIGH · CVSS 7.1 EPSS 0.12%

Source: NVD + CISA KEV + EPSS · Published 2026-09-18 · Last synced 2026-10-12

CyberRota Analysis

AI-Generated

An improper certificate validation vulnerability in the Email API of Synology DiskStation Manager prior to specified versions allows man-in-the-middle attackers to intercept communications, potentially leading to unauthorized file access and denial-of-service attacks. Organizations using affected versions of DSM should prioritize patching to mitigate the risk of data breaches and service disruptions. This is particularly critical for environments handling sensitive information or relying on email functionalities for operational continuity.

CVE
CVE-2026-40539
Severity
HIGH
CVSS
7.1
EPSS
0.12%

Original NVD 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.