Cross-Site Scripting Vulnerability in Synology DiskStation Manager
CVE-2026-40534

5.4MEDIUM

Key Information:

Vendor

Synology
Status
Diskstation Manager (dsm)
Vendor
CVE Published:
18 September 2026

What is CVE-2026-40534?

An improperly handled user input during the web page generation process in the Video API of Synology DiskStation Manager can lead to cross-site scripting attacks. This vulnerability allows remote authenticated users to read or write limited files when the video player is activated, potentially exposing sensitive information and compromising system integrity.

Affected Version(s)

DiskStation Manager (DSM) 7.3

DiskStation Manager (DSM) 7.3 < 7.3.2-86009-2

DiskStation Manager (DSM) 7.2.2 < 7.2.2-72806-7

References

https://www.synology.com/en-global/security/advisory/Syno...
vendor-advisory

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

HE JIASHENG
.