---
id: "CVE-2026-81557"
page: "https://infrastack.ai/live/CVE-2026-81557"
kind: "vulnerability"
aliases: ["CVE-2026-81557"]
title: "Synology DSM: DSMNotify input flaw lets logged-in users read or write files"
severity: "medium"
cvss: 5.4
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["dsm", "infrastructure", "nas", "self-hosted", "synology"]
not_affected_if: ["dsm-patched", "dsmnotify-not-installed"]
published_at: "2026-11-12T04:17:20+00:00"
first_seen_at: "2026-11-12T04:47:09+00:00"
updated_at: "2026-11-12T04:47:56+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-81557", "first_seen_at": "2026-11-12T04:47:09+00:00"}]
exploit_sources: []
---

# Synology DSM: DSMNotify input flaw lets logged-in users read or write files

Link for people: https://infrastack.ai/live/CVE-2026-81557 (this .md is for agents)

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.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Open DSM and check the installed version under Control Panel > Info Center; compare it with `7.3.2-86009-5` and `7.4.1-90080-1`
- Confirm whether DSMNotify is installed and enabled under Package Center

## Fix

- Synology DiskStation Manager 7.3.x: move to `7.3.2-86009-5` or later
- Synology DiskStation Manager 7.4.x: move to `7.4.1-90080-1` or later

## Timeline

- 2026-11-12T04:47:09+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-81557

## From the sources

An 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.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_