Stored cross-site scripting in DiskStation Manager (DSM) - CVE-2026-40534
Published: April 16, 2026
Vulnerability identifier: #VU126267
CSH Severity: Low
CVSS v4: 5.1 [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]
CVE-ID: CVE-2026-40534
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
DiskStation Manager (DSM)
How to mitigate CVE-2026-40534
Install security update from vendor's website.
DiskStation Manager (DSM) - addressed in versions 7.2.1-69057-10, 7.2.2-72806-7, 7.3.2-86009-2