What’s Vulnerable › Vulnerabilities
CVE-2026-40539
- Severity: high (CVSS 7.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-18 · updated 2026-09-18
- Weakness: CWE-295
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.
Affected products
- Synology DiskStation Manager: from 7.3 before 7.3.2-86009-2; from 7.2.2 before 7.2.2-72806-7; from 7.2.1 before 7.2.1-69057-10 — fixed in 7.2.1-69057-10, 7.2.2-72806-7, 7.3.2-86009-2
How to fix
Upgrade to a fixed version: Synology DiskStation Manager 7.2.1-69057-10, 7.2.2-72806-7, 7.3.2-86009-2. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-40539 or the next vulnerability affects your stack