Cross-site scripting in DiskStation Manager (DSM) - CVE-2026-13623
Published: September 20, 2026
Vulnerability identifier: #VU151484
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-13623
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to read or write limited files.
The vulnerability exists due to cross-site scripting in Theme API when processing input during web page generation. A remote privileged user can submit input to Theme API to read or write limited files.
User interaction is required.
Affected software
DiskStation Manager (DSM)
How to mitigate CVE-2026-13623
Install security update from vendor's website.
DiskStation Manager (DSM) - addressed in versions 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4, 7.4-90075