CVE-2026-40541
CriticalCVSS 9.0Exploitation Probability (EPSS)
Low risk40th percentile - higher than 40% of all known CVEs
Summary
A Cross-site Scripting vulnerability in the extract domain function in Synology Chat Server before 2.4.5-22148 allows remote authenticated users, via UI interaction, to read or write arbitrary files and conduct denial-of-service attacks in DSM.
Risk Assessment
An authenticated user can access sensitive files and disrupt DSM operations.
Recommendation
Update Synology Chat Server to version 2.4.5-22148 or later.
Other vulnerabilities in Synology Chat Server
See all- CVE-2026-9548Medium
A Cross-site Scripting vulnerability in the extract domain function in Synology Chat Server before 2.4.5-22148 allows remote authenticated users, via UI interaction, to read or write restricted files and conduct limited denial-of-service attacks in DSM.
- CVE-2026-9491Medium
A Server-Side Request Forgery (SSRF) vulnerability in the webhook function in Synology Chat Server before 2.4.5-22148 allows remote authenticated users to obtain non-sensitive information.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS