CVE-2026-40537 Server-side request forgery in DiskStation Manager (DSM)
Authenticated attackers can exploit an SSRF flaw in the PersonMail API to obtain non-sensitive information from Synology DSM.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-40537?
CVE-2026-40537 is a medium-severity server-side request forgery vulnerability in Synology DiskStation Manager (DSM), published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A server-side request forgery (SSRF) vulnerability in PersonMail API in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows remote authenticated users to obtain non-sensitive information.
Weakness: CWE-918
Which versions are affected by CVE-2026-40537?
How do I fix CVE-2026-40537?
No fix has been published for CVE-2026-40537 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-40537 being exploited?
There is no known exploitation of CVE-2026-40537 in the wild and no public exploit code.
Sources
Also known as GHSA-7q9q-gp64-8j9m.