---
id: "CVE-2026-19414"
page: "https://infrastack.ai/live/CVE-2026-19414"
kind: "vulnerability"
aliases: ["CVE-2026-19414"]
title: "Synology DSM: Promotion API lets logged-in users write specific files"
severity: "medium"
cvss: 4.3
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["dsm", "infrastructure", "nas", "self-hosted", "synology"]
not_affected_if: ["no-remote-accounts", "patched-dsm"]
published_at: "2026-11-12T04:17:19+00:00"
first_seen_at: "2026-11-12T04:47:09+00:00"
updated_at: "2026-11-12T04:48:06+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19414", "first_seen_at": "2026-11-12T04:47:09+00:00"}]
exploit_sources: []
---

# Synology DSM: Promotion API lets logged-in users write specific files

Link for people: https://infrastack.ai/live/CVE-2026-19414 (this .md is for agents)

The Promotion API in Synology DiskStation Manager lacks an authorization check, so a remote user with a valid account can write certain files on the NAS. The sources do not say what files or what further access follows from that write.

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

## How to check

- Open DSM and note the version under Control Panel > Info Center; compare against `7.3.2-86009-5` and `7.4.1-90080-1`
- Check whether any DSM user accounts beyond administrators can log in remotely

## Fix

- Move DSM 7.3 installs to `7.3.2-86009-5` or later
- Move DSM 7.4 installs to `7.4.1-90080-1` or later

## Timeline

- 2026-11-12T04:47:09+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-19414

## From the sources

A missing authorization vulnerability in the Promotion API in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1 allows remote authenticated users to write specific files.

---

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