Medium [CVE-2026-9548] 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
This medium-severity Synology advisory covers CVE-2026-9548 affecting Synology Chat Server for DSM 7.3, Synology Chat Server for DSM 7.2.2, Synology Chat Server for DSM 7.2.1.
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Summary
Synology has released a security update for the Synology Chat Server package in DSM to address multiple vulnerabilities: CVE-2026-40541 allows remote authenticated users to read or write arbitrary files and conduct denial-of-service attacks. CVE-2026-9491 allows remote authenticated users to obtain non-sensitive information.
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Affected products named by the advisory: Synology Chat Server for DSM 7.3; Synology Chat Server for DSM 7.2.2; Synology Chat Server for DSM 7.2.1.
- Synology Chat Server for DSM 7.3 before 2.4.5-22148
- Synology Chat Server for DSM 7.2.2 before 2.4.5-22148
- Synology Chat Server for DSM 7.2.1 before 2.4.5-22148
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
- 2.4.5-22148
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Upgrade the affected Synology product to a fixed release: 2.4.5-22148.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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