CVE-2025-66593 Path traversal in Synology Assistant
Local attackers can write arbitrary files and cause denial of service during installation due to origin validation errors in Synology Assistant.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-66593?
CVE-2025-66593 is a medium-severity path traversal vulnerability in Synology Assistant, published on 27 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
An origin validation error vulnerability in Synology Assistant before 7.0.6-50085 allows local users to write arbitrary files with restricted content and conduct denial-of-service during installation.
Weakness: CWE-346
Which versions are affected by CVE-2025-66593?
It affects 1 product.
Products include Synology Assistant.
How do I fix CVE-2025-66593?
No fix has been published for CVE-2025-66593 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2025-66593 being exploited?
There is no known exploitation of CVE-2025-66593 in the wild and no public exploit code.
Other vulnerabilities in Synology Assistant
Sources
Also known as GHSA-43p3-6ww8-9fwv.