Cross-Site Scripting Vulnerability in Synology Chat Server by Synology
CVE-2026-9548

6.5MEDIUM

Key Information:

Vendor

Synology
Status
Synology Chat Server
Vendor
CVE Published:
28 August 2026

What is CVE-2026-9548?

A Cross-Site Scripting vulnerability exists in the Synology Chat Server prior to version 2.4.5-22148, allowing remote authenticated users to leverage UI interactions to read or write restricted files. This weakness can also lead to limited denial-of-service attacks within the DiskStation Manager (DSM). Certified users may unknowingly exploit this issue, compromising the integrity of sensitive information and impacting server availability.

Affected Version(s)

Synology Chat Server *

References

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

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Warisse Valentin (Aytio)
.