CVE-2026-40541

Name of the Vulnerable Software and Affected Versions Synology Chat Server versions prior to 2.4.5-22148

Description An improper neutralization of input during web page generation, known as Cross-site Scripting (XSS), occurs in the extract domain component. This allows remote authenticated users, through UI interaction, to read or write arbitrary files and conduct denial-of-service attacks in DSM. This issue may also expose users to session theft, credential compromise, or unauthorized actions within the application.

Recommendations Update Synology Chat Server to version 2.4.5-22148 or later. Restrict access to administrative interfaces. Monitor for unusual login activity or suspicious chat content. Educate users to avoid clicking unexpected links or embedded content.