Authentication Flaw in Synology DiskStation Manager Affects Remote File Access
CVE-2026-74857

8.8HIGH

Key Information:

Vendor

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

What is CVE-2026-74857?

A critical authentication flaw in the Auth API of Synology DiskStation Manager allows remote authenticated users to manipulate files on the system. This vulnerability can lead to unauthorized file access, both reading and writing of arbitrary files, as well as potential denial-of-service attacks. Users are advised to update to the latest version to mitigate any risks associated with this issue.

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:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

p4p3r(@P4P3R-HAK)
.