---
id: "CVE-2026-15201"
page: "https://infrastack.ai/live/CVE-2026-15201"
kind: "vulnerability"
aliases: ["CVE-2026-15201"]
title: "Synology DSM: Support Form certificate check flaw enables man-in-the-middle file access"
severity: "medium"
cvss: 5.9
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["dsm", "infrastructure", "nas", "self-hosted", "synology"]
not_affected_if: ["no-support-form-use", "patched-dsm"]
published_at: "2026-11-12T04:17:18+00:00"
first_seen_at: "2026-11-12T04:47:08+00:00"
updated_at: "2026-11-12T04:47:52+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15201", "first_seen_at": "2026-11-12T04:47:08+00:00"}]
exploit_sources: []
---

# Synology DSM: Support Form certificate check flaw enables man-in-the-middle file access

Link for people: https://infrastack.ai/live/CVE-2026-15201 (this .md is for agents)

The Support Form in Synology DiskStation Manager does not properly validate certificates when submitting a support request. A network attacker positioned between the NAS and Synology can read arbitrary files and write specific files during that submission.

_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; compare it with the fixed versions below.

## Fix

- DSM `7.3.2-86009-5` for the 7.3 branch
- DSM `7.4.1-90080-1` for the 7.4 branch

## Timeline

- 2026-11-12T04:47:08+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-15201

## From the sources

An improper certificate validation vulnerability in the Support Form in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1 allows man-in-the-middle attackers to read arbitrary files and write specific files during support form submission.

---

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