Missing Authorization Vulnerability in Synology DiskStation Manager
CVE-2026-81559

4.3MEDIUM

Key Information:

Vendor

Synology
Status
Diskstation Manager (dsm)
Vendor
CVE Published:
12 November 2026

What is CVE-2026-81559?

A vulnerability in the TaskScheduler API of Synology DiskStation Manager (DSM) allows remote authenticated users to write specific files due to insufficient authorization checks. This issue affects versions prior to 7.3.2-86009-5 and 7.4.1-90080-1, posing a risk to system integrity and data protection. Users must ensure they upgrade to the latest versions to secure their systems against potential unauthorized file modifications.

Affected Version(s)

DiskStation Manager (DSM) 7.4.1

DiskStation Manager (DSM) 7.4.1 < 7.4.1-90080-1

DiskStation Manager (DSM) 7.3.2 < 7.3.2-86009-5

References

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

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Lubin Leclanche
.