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.
- Published Sep 18, 2026
- CVSS 7.1 high
- 0.1% chance of exploitation in the next 30 days (EPSS)
- A fix is available