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Advisory severityCritical9.0Synology Updated

Critical [CVE-2026-40541 +2] 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

This critical-severity Synology advisory covers CVE-2026-40541 and CVE-2026-9491 and 1 more CVE affecting Synology Chat Server for DSM 7.3, Synology Chat Server for DSM 7.2.2, Synology Chat Server for DSM 7.2.1.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations. This bulletin covers 3 CVEs; its score, affected versions and guidance may apply to different issues within that bulletin.

Synology-SA-26:10 Source published Source updated

VulniPulse record published Record updated

CVE-2026-40541CVE-2026-9491CVE-2026-9548
Affected products & platforms
SynologyDSM (DiskStation Manager)
Open source advisory

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Summary

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.

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.

Affected versions
  • before 2.4.5-22148

Official advisory · high-confidence parse· fetched 3 days ago·verify at source

Fixed versions
  • 2.4.5-22148

Official advisory · high-confidence parse· fetched 3 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Upgrade the affected Synology product to a fixed release: 2.4.5-22148.

Official advisory · high-confidence parse· fetched 3 days ago·verify at source

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