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CVE-2025-66592

6.1 · MEDIUM

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-ser…

Published May 27, 2026synologyCWE-346EPSS 0.09%

Overview

CVE-2025-66592 is a medium-severity vulnerability affecting synology active_backup_for_business_agent. It was published on May 27, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from synology. Update active_backup_for_business_agent to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
synologyactive_backup_for_business_agent>= 0, < 3.1.0-4967Affected

References

Refwww.synology.com/en-global/security/advisory/Synology_SA_25_16

How CyberStrike helps

Frequently asked questions

What is CVE-2025-66592?

CVE-2025-66592 is a medium-severity vulnerability affecting synology active_backup_for_business_agent. It was published on May 27, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2025-66592?

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-66592?

Check the references section for vendor advisories and patches from synology. Update active_backup_for_business_agent to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-66592?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-66592 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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