CVE-2026-40541

Published Aug 28, 2026 CVSS 3.1 · 9 Critical EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Synology
Synology synology Chat Server
Vendors & Products Synology
Synology synology Chat Server
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Cross‑Site Scripting in Synology Chat Server Allowing Remote Authenticated Arbitrary File Access and DoS
Type Values Removed Values Added
Title Cross‑Site Scripting in Synology Chat Server Allowing Remote Authenticated Arbitrary File Access and DoS
Type Values Removed Values Added
Description 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.
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
synology
Published
Updated
Aug 28, 2026, 11:44 AM
Reserved
Apr 14, 2026, 1:01 AM
Status
Awaiting Analysis
Published
Aug 28, 2026, 8:16 AM
Modified
Sep 1, 2026, 8:54 PM