CVE-2025-66592

Analyzed Analyzed - Analysis Complete

Origin Validation Error in Synology Active Backup for Business Agent

Publication date: 2026-05-27

Last updated on: 2026-06-02

Assigner: Synology Inc.

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-05-27

Last Modified

2026-06-02

Generated

2026-07-06

AI Q&A

2026-05-27

EPSS Evaluated

2026-07-05

NVD

CVE-2025-66592

EUVD

EUVD-2025-209962

Affected Vendors & Products

Vendor	Product	Version / Range
synology	active_backup_for_business_agent	to 3.1.0-4967 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-346	The product does not properly verify that the source of data or communication is valid.

Attack-Flow Graph

Executive Summary

This vulnerability is an origin validation error in Synology Active Backup for Business Agent versions before 3.1.0-4967. It allows local users to write arbitrary files with restricted content during the installation process.

Impact Analysis

The vulnerability can allow local users to write arbitrary files with restricted content, which may lead to unauthorized changes or damage to the system. It has a moderate severity with a CVSS base score of 6.1, indicating a significant impact, including potential high availability impact.

Mitigation Strategies

To mitigate this vulnerability, users are advised to upgrade the Synology Active Backup for Business Agent to version 3.1.0-4967 or later.

Detection Guidance

There are no specific detection methods or commands provided to identify this vulnerability on your network or system.

The recommended action is to verify the version of Synology Active Backup for Business Agent installed and ensure it is updated to version 3.1.0-4967 or later, as this update addresses the vulnerability.

Compliance Impact

The provided information does not specify how the vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.

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