CVE-2025-66593 | BDVDB-2026-335199 Detail

SynologySynology Assistant

Description#

An origin validation error vulnerability in Synology Assistant before 7.0.6-50085 allows local users to write arbitrary files with restricted content and conduct denial-of-service during installation.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact low, availability impact high. Attack vector: local.

Weaknesses#

CWE-346 Origin Validation Error

References#

https://www.synology.com/en-global/security/advisory/Synology_SA_25_17

Exploit#

No public exploit known

History#

Version 12026-05-27Record published in the CVE List.
Version 22026-06-02Most recent update recorded in the CVE List.

Published

Published: 2026-05-27
Last modified: 2026-06-02

Vendor information

Vendor: Synology
Product: Synology Assistant

All Synology vulnerabilities

Score

6.1 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 0.3.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 7.0.6-50085
Fixed
7.0.6-50085

Scoring System

CVSS v4.0

Not available

CVSS v3.1

6.1 Medium

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

Metric breakdown
Attack Vector	Local
Attack Complexity	Low
Privileges Required	None
User Interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity	Low
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).