---
id: "CVE-2026-87801"
page: "https://infrastack.ai/live/CVE-2026-87801"
kind: "vulnerability"
aliases: ["CVE-2026-87801"]
title: "Synology DSM: API framework flaw lets logged-in users read arbitrary files"
severity: "medium"
cvss: 6.5
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Synology DiskStation Manager (DSM)", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["dsm", "infrastructure", "nas", "self-hosted", "synology"]
not_affected_if: ["no-synology-nas", "patched-dsm"]
published_at: "2026-11-12T04:17:21+00:00"
first_seen_at: "2026-11-12T04:47:10+00:00"
updated_at: "2026-11-12T04:47:48+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-87801", "first_seen_at": "2026-11-12T04:47:10+00:00"}]
exploit_sources: []
---

# Synology DSM: API framework flaw lets logged-in users read arbitrary files

Link for people: https://infrastack.ai/live/CVE-2026-87801 (this .md is for agents)

An insertion of sensitive information into sent data flaw in the API framework of Synology DiskStation Manager lets a remote user with an account read arbitrary files on the NAS. The NVD entry rates it medium with a CVSS score of 6.5.

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

## Affected

- vendor:Synology DiskStation Manager (DSM) affected range not listed fixed no fixed version listed

## How to check

- Open DSM and check the installed version under Control Panel > Info Center (unknown exact path beyond this; sources do not say more)
- Compare the version against the fixed builds listed in the fix field

## Fix

- Synology DSM 7.3 branch: `7.3.2-86009-5` or later
- Synology DSM 7.4 branch: `7.4.1-90080-1` or later

## Timeline

- 2026-11-12T04:47:10+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-87801

## From the sources

An insertion of sensitive information into sent data vulnerability in the API framework in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1 allows remote authenticated users to read arbitrary files.

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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_