CVE-2026-9491: Synology Chat Server

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

A server-ide request forgery (SSRF) vulnerability in webhook in Synology Chat Server before 2.4.5-22148 allows remote authenticated users to obtain non-sensitive information.

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.