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CVE-2025-66592: Origin Validation Error in Synology Synology Active Backup for Business Agent

0
Medium
VulnerabilityCVE-2025-66592cvecve-2025-66592
Published: Wed May 27 2026 (05/27/2026, 08:43:05 UTC)
Source: CVE Database V5
Vendor/Project: Synology
Product: Synology Active Backup for Business Agent

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 during installation.

CVSS v3.1

Score 6.1medium

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 05/27/2026, 09:34:11 UTC

Technical Analysis

This vulnerability arises from an origin validation error in Synology Active Backup for Business Agent prior to version 3.1.0-4967. It permits local users to write arbitrary files containing restricted content during installation, potentially leading to integrity and availability issues. The CVSS 3.1 base score is 6.1, reflecting medium severity with local attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, no confidentiality impact, low integrity impact, and high availability impact. No vendor advisory or patch information is currently available to confirm remediation status.

Potential Impact

Exploitation of this vulnerability allows local users to write arbitrary files with restricted content during installation, which can compromise system integrity and availability. There is no impact on confidentiality. No known exploits are reported in the wild.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict local user access to systems running vulnerable versions and monitor installation processes for unauthorized file modifications.

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Technical Details

Data Version
5.2
Assigner Short Name
synology
Date Reserved
2025-12-05T03:19:16.760Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
null

Threat ID: 6a16b387e29bf47b50abe5d3

Added to database: 5/27/2026, 9:04:07 AM

Last enriched: 5/27/2026, 9:34:11 AM

Last updated: 5/29/2026, 1:45:36 PM

Views: 26

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