---
id: "CVE-2026-19048"
page: "https://infrastack.ai/live/CVE-2026-19048"
kind: "vulnerability"
aliases: ["CVE-2026-19048"]
title: "Synology DSM: thumbnail component follows links, lets users write arbitrary files"
severity: "high"
cvss: 8.1
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["dsm", "infrastructure", "nas", "self-hosted", "synology"]
not_affected_if: ["fixed-dsm-version", "no-authenticated-users"]
published_at: "2026-11-12T04:17:19+00:00"
first_seen_at: "2026-11-12T04:47:09+00:00"
updated_at: "2026-11-12T04:47:41+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19048", "first_seen_at": "2026-11-12T04:47:09+00:00"}]
exploit_sources: []
---

# Synology DSM: thumbnail component follows links, lets users write arbitrary files

Link for people: https://infrastack.ai/live/CVE-2026-19048 (this .md is for agents)

An improper link resolution flaw in the thumbnail component of Synology DiskStation Manager lets a logged-in user write files to arbitrary locations and crash the service. The sources rate it high severity (CVSS 8.1) but report no active exploitation.

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

## How to check

- Check the DSM version under Control Panel > Info Center; `unknown` for the exact command
- Compare the installed version against the fixed releases listed in the fix field

## Fix

- Synology DSM `7.3.2-86009-5` or later on the 7.3.2 branch
- Synology DSM `7.4.1-90080-1` or later on the 7.4.1 branch

## Timeline

- 2026-11-12T04:47:09+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-19048

## From the sources

An improper link resolution before file access vulnerability in the thumb in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1 allows remote authenticated users to write arbitrary files and conduct denial-of-service attacks.

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