Synology Assistant <7.0.6: Local File Write via Origin Validation
CVE-2025-66593 Published on May 27, 2026

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.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2025-66593 can be exploited with local system access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and a high impact on availability.

Attack Vector:
LOCAL
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
REQUIRED
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
LOW
Availability Impact:
HIGH

Weakness Type

Origin Validation Error

The software does not properly verify that the source of data or communication is valid.


Affected Versions

Synology Assistant:

Exploit Probability

EPSS
0.00%
Percentile
0.18%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.