CVE-2026-81557 · Infrastructure
NO FIX YET · SEE WHAT TO DO
A web page generation flaw in DSMNotify, a component of Synology DiskStation Manager, lets an authenticated user read or write specific files on the NAS. The attacker must already have a valid account on the device.
first public Nov 12, 2026 · 1 source
Check it with your coding agent
It reads this page and tells you if your code or app is affected.
Any Synology NAS running DSM before the fixed builds where DSMNotify is present. Exposure needs a valid DSM user account, so systems without shared or untrusted user accounts carry less risk. Devices with no user accounts beyond the administrator are lower risk but should still be patched.
Not affected if dsm-patched, dsmnotify-not-installed
Who cares dsm, nas, self-hosted, synology
7.3.2-86009-5 and 7.4.1-90080-17.3.2-86009-5 or later7.4.1-90080-1 or laterAn improper neutralization of input during web page generation vulnerability in the DSMNotify 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 specific files.
This page as .md · .json · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.
Are you affected?
Ask from here. InfraStack checks the affected versions against your stack and answers in your inbox.
InfraStack checks the affected versions against your stack and answers in Slack, with the evidence and the fix.
InfraStack checks it against your stack and answers on your report, with the evidence and the fix.