What is GHSA-mqfj-89cq-4gj9?

GHSA-mqfj-89cq-4gj9 is a security advisory published by GitHub Security Advisories with High severity. An improper certificate validation vulnerability in Email API in Synology DiskStation Manager ...

Which CVE IDs does GHSA-mqfj-89cq-4gj9 cover?

GHSA-mqfj-89cq-4gj9 covers the following CVE IDs: CVE-2026-40539. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-mqfj-89cq-4gj9?

GHSA-mqfj-89cq-4gj9 has a CVSS v3 base score of 7.1, published by GitHub Security Advisories.

GHSA-mqfj-89cq-4gj9HighCVSS 7.1

An improper certificate validation vulnerability in Email API in Synology DiskStation Manager ...

Vendor

GitHub Security Advisories

Published

September 18, 2026

Last Modified

September 18, 2026

🔗 CVE IDs covered (1)

CVE-2026-40539 →

📋 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.

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-40539
https://www.synology.com/en-global/security/advisory/Synology_SA_26_06
https://github.com/advisories/GHSA-mqfj-89cq-4gj9