Stored cross-site scripting in DiskStation Manager (DSM) - CVE-2026-40534

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Main Vulnerability Database Vulnerabilities #VU126267

Stored cross-site scripting in DiskStation Manager (DSM) - CVE-2026-40534

Published: April 16, 2026


Vulnerability identifier: #VU126267
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-40534
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Synology Inc.
Affected software:
DiskStation Manager (DSM)

Detailed vulnerability description

The vulnerability allows a remote user to execute arbitrary script in a user's browser.

The vulnerability exists due to cross-site scripting in DSM when rendering crafted web content. A remote user can inject specially crafted content to execute arbitrary script in a user's browser.

User interaction is required.


How to mitigate CVE-2026-40534

Install security update from vendor's website.

Sources