---
id: "CVE-2026-81584"
page: "https://infrastack.ai/live/CVE-2026-81584"
kind: "vulnerability"
aliases: ["CVE-2026-81584"]
title: "Synology DSM: User API SQL flaw lets LDAP servers read or write files"
severity: "high"
cvss: 8.1
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["active-directory", "dsm", "infrastructure", "ldap", "nas", "synology"]
not_affected_if: ["already-patched", "local-accounts-only", "no-ldap-integration"]
published_at: "2026-11-12T04:17:21+00:00"
first_seen_at: "2026-11-12T04:47:10+00:00"
updated_at: "2026-11-12T04:47:40+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-81584", "first_seen_at": "2026-11-12T04:47:10+00:00"}]
exploit_sources: []
---

# Synology DSM: User API SQL flaw lets LDAP servers read or write files

Link for people: https://infrastack.ai/live/CVE-2026-81584 (this .md is for agents)

Synology DiskStation Manager's User API builds SQL commands from data supplied by an LDAP or Active Directory server without proper neutralization. A remote attacker who controls such a directory server can read or write arbitrary files on the NAS and cause denial of service.

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

## How to check

- Check the installed DSM version in Control Panel > Info Center (or `cat /etc/VERSION` over SSH on the NAS)
- Check whether LDAP or Active Directory integration is enabled for the NAS user accounts

## Fix

- Move DSM to `7.3.2-86009-5` or later on the 7.3 branch
- Move DSM to `7.4.1-90080-1` or later on the 7.4 branch

## Timeline

- 2026-11-12T04:47:10+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-81584

## From the sources

An improper neutralization of special elements used in an SQL command vulnerability in the User API in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1 allows remote attackers with control over a compromised LDAP or Active Directory server to read or 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_