CVE-2025-66592

MEDIUM 6.1

CVSS Score

6.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-346
Vendor	synology
Product	synology active backup for business agent
Published	May 27, 2026
Last Updated	Jun 2, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

Affected Versions

Synology / Synology Active Backup for Business Agent

* < 3.1.0-4967

References

NVD ↗ CVE.org ↗ EPSS Data ↗

synology.com: https://www.synology.com/en-global/security/advisory/Synology_SA_25_16

Credits

Sheikh Rishad (https://x.com/sheikhrishad0)