CVE-2025-66592 Path traversal in Synology Active Backup for Business Agent
Local attackers can write arbitrary files and cause denial of service during installation due to origin validation errors in the Synology backup agent.
- 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-2025-66592?
CVE-2025-66592 is a medium-severity path traversal vulnerability in Synology Active Backup for Business Agent, 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 Active Backup for Business Agent before 3.1.0-4967 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-2025-66592?
It affects 1 product.
Products include Synology Active Backup for Business Agent.
How do I fix CVE-2025-66592?
No fix has been published for CVE-2025-66592 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-2025-66592 being exploited?
There is no known exploitation of CVE-2025-66592 in the wild and no public exploit code.
Other vulnerabilities in Synology Active Backup for Business Agent
- CVE-2024-47265 Path traversal in Active Backup for Business
- CVE-2023-52949 Missing authorization in Synology Active Backup for Business Agent
- CVE-2023-52950 Information disclosure in Synology Active Backup for Business Agent
- CVE-2023-52948 Information disclosure in Synology Active Backup for Business Agent
- CVE-2024-47264 Path traversal in Active Backup for Business
Sources
Also known as GHSA-v5xx-f9gc-j856.