CVE-2026-40541

CRITICAL CVSS 3.1: 9.0 EPSS 0.48%
Updated Sep 01, 2026
Synology
Parameter Value
CVSS 9.0 (CRITICAL)
Affected Versions before 2.4.5
Type CWE-79 (Cross-Site Scripting (XSS))
Vendor Synology
Public PoC No

An improper neutralization of input during web page generation ('Cross-site Scripting') vulnerability in extract domain in Synology Chat Server before 2.4.5-22148 allows remote authenticated users, via a UI interaction, to read or write arbitrary files and conduct denial-of-service attacks in DSM.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
Required
User action required

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Vulnerable Products

synology:synology chat server