Is CVE-2026-74857 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-74857 being exploited in the wild.

How severe is CVE-2026-74857?

High severity, with a CVSS score of 8.8, published 12 November 2026.

Which products and versions are affected?

Synology DiskStation Manager 7.3.x before 7.3.2-86009-5 and 7.4.x before 7.4.1-90080-1.

Is there a fix for CVE-2026-74857?

Yes: fixed in 7.3.2-86009-5 (DSM 7.3), 7.4.1-90080-1 (DSM 7.4). Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-74857 attacked?

It is attacked over the network.

Am I affected by CVE-2026-74857?

Check whether you run Synology DiskStation Manager at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-74857: Synology DiskStation Manager missing critical authentication step in Auth API

CVE-2026-74857 · Severity: high · CVSS 8.8 · Published 2026-11-12

Synology DiskStation Manager is a management system for network-attached storage devices that organisations use to centralise file storage and backup. A flaw in its authentication process allows authenticated users to bypass security checks and read, write, or delete arbitrary files, or trigger system outages. This gives attackers who have compromised a legitimate user account the ability to escalate their access significantly.

Technologies: Synology DiskStation Manager. Vendors: Synology.

Quick answers

Is CVE-2026-74857 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-74857 being exploited in the wild.
How severe is CVE-2026-74857?: High severity, with a CVSS score of 8.8, published 12 November 2026.
Which products and versions are affected?: Synology DiskStation Manager 7.3.x before 7.3.2-86009-5 and 7.4.x before 7.4.1-90080-1.
Is there a fix for CVE-2026-74857?: Yes: fixed in 7.3.2-86009-5 (DSM 7.3), 7.4.1-90080-1 (DSM 7.4). Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-74857 attacked?: It is attacked over the network.
Am I affected by CVE-2026-74857?: Check whether you run Synology DiskStation Manager at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 7.3.2-86009-5 (DSM 7.3), 7.4.1-90080-1 (DSM 7.4)

Technical details

CVE-2026-74857 is a missing critical step in authentication (CWE-304) within the Auth API that allows remote authenticated users to bypass security controls and conduct arbitrary file read/write operations or denial-of-service attacks. The vulnerability affects DSM 7.3 and 7.4 before versions 7.3.2-86009-5 and 7.4.1-90080-1 respectively, and requires prior authentication to exploit (PR:L, network vector).

Affected products

Synology DiskStation Manager 7.3.x before 7.3.2-86009-5 and 7.4.x before 7.4.1-90080-1

Timeline

2026-11-10: disclosed
2026-11-12: advisory

References

https://www.synology.com/en-global/security/advisory/Synology_SA_26_18

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