CVE-2026-9548: Synology Chat Server

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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 restricted files and conduct limited denial-of-service attacks in DSM.

Affected products

• Synology Synology Chat Server: before 2.4.5-22148 (fixed in 2.4.5-22148)

Published 2026-08-28. Last modified 2026-09-01.