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.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00004.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Synology Synology Active Backup for Business Agent affected
Version Status Constraints
* affected < 3.1.0-4967

No data.

No data.

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Vendors Products
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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://www.synology.com/en-global/security/advisory/Synology_SA_25_16 cve-icon cve-icon
History

Wed, 27 May 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 27 May 2026 12:00:00 +0000

Type Values Removed Values Added
First Time appeared Synology
Synology active Backup For Business Agent
Vendors & Products Synology
Synology active Backup For Business Agent

Wed, 27 May 2026 10:45:00 +0000

Type Values Removed Values Added
Title Local User File Write Vulnerability in Synology Active Backup for Business Agent

Wed, 27 May 2026 09:00:00 +0000

Type Values Removed Values Added
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.
Weaknesses CWE-346
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: synology

Published:

Updated: 2026-05-27T12:40:03.500Z

Reserved: 2025-12-05T03:19:16.760Z

Link: CVE-2025-66592

cve-icon Vulnrichment

Updated: 2026-05-27T12:39:58.229Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-27T09:16:27.633

Modified: 2026-05-27T14:54:20.160

Link: CVE-2025-66592

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-27T11:45:15Z

Weaknesses