CVE-2025-66592

medium

Published 2026-05-27 · Modified 2026-06-02

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

5.6

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

CVSS v4 NEW

—

not yet in upstream

VIR risk

5.6

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.

Predictions

Exploit likelihood

56%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Application impact

Vendor	Product	Versions	Fixed
synology	active_backup_for_business_agent	`{"endExcluding":"3.1.0-4967"}`	`3.1.0-4967`

References

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

CWEs

CWE-346

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.