CVE-2026-74857 · Infrastructure
NO FIX YET · SEE WHAT TO DO
Synology DiskStation Manager has a missing authentication step in its Auth API, so a remote user who already has an account can read or write arbitrary files on the NAS. The same flaw can also be used to knock the device offline with denial-of-service attacks.
first public Nov 12, 2026 · 1 source
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Any Synology NAS running DiskStation Manager below the fixed versions is in scope. Exposure is greatest where DSM is reachable from the internet, since the attacker must first hold a valid user account on the device. Devices that are not running DSM, or that are patched to the fixed builds, can skip this.
Not affected if no-remote-access, patched-dsm-version
Who cares dsm, nas, self-hosted, synology
7.3.2-86009-5 or later for the 7.3 branch7.4.1-90080-1 or later for the 7.4 branchA missing critical step in authentication vulnerability in the Auth API in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1 allows remote authenticated users to read or write arbitrary files and conduct denial-of-service attacks.
This page as .md · .json · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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