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TI-2025-40996 Aliases CVE-2025-66592GHSA-v5xx-f9gc-j856

Origin validation error in Synology Active Backup for Business Agent

Priority LOW 26CWE-346Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-346.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00086 0th percentileScored 2026-11-07
Fix Fixed Synology Active Backup for Business Agent (Synology): 3.1.0-4967

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SynologySynology Active Backup for Business Agentbefore 3.1.0-49673.1.0-4967Patch availableCNA
  • Synology Active Backup for Business Agent VendorSynology Affected before 3.1.0-4967 Fixed in 3.1.0-4967 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:synology:active_backup_for_business_agent:*:*:*:*:*:*:*:*before 3.1.0-4967VulnerableSynology
  • cpe:2.3:a:synology:active_backup_for_business_agent:*:*:*:*:*:*:*:* Versions before 3.1.0-4967 Vulnerable ·Synology

Remediation

  • Fix · CNA Synology Active Backup for Business Agent (Synology) Fixed in 3.1.0-4967

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-66592
  2. 2026-10-03 Alias added: GHSA-v5xx-f9gc-j856

References

Advisory 1

  • TI-2024-31599 Path traversal in Synology Active Backup for Business CVSS 3.1MEDIUM 6.5
  • TI-2024-31600 Improper limitation of a pathname to a restricted directory ('Path Traversal')… CVSS 3.1MEDIUM 6.5
  • TI-2023-29269 Missing authentication in Synology Active Backup for Business Agent CVSS 3.1MEDIUM 5.5
  • TI-2023-29270 Missing encryption of sensitive data vulnerability in login component in Synology Active… CVSS 3.1MEDIUM 5.3
  • TI-2023-29268 Missing encryption of sensitive data vulnerability in settings functionality in Synology… CVSS 3.1MEDIUM 5.0
  • TI-2023-29267 Missing authentication in Synology Active Backup for Business Agent CVSS 3.1MEDIUM 4.0
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences