---
id: "CVE-2026-18596"
page: "https://infrastack.ai/live/CVE-2026-18596"
kind: "vulnerability"
aliases: ["CVE-2026-18596"]
title: "Synology DSM: OTP alternate path lets attackers bypass login, read or write files"
severity: "high"
cvss: 8.1
epss: null
exploited: false
status: "open"
category: "vendor"
products: [{"name": "Synology DiskStation Manager", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["dsm", "nas", "self-hosted", "synology", "vendor"]
not_affected_if: ["dsm-already-patched", "no-remote-login-access"]
published_at: "2026-11-12T04:17:18+00:00"
first_seen_at: "2026-11-12T04:47:09+00:00"
updated_at: "2026-11-12T04:47:44+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18596", "first_seen_at": "2026-11-12T04:47:09+00:00"}]
exploit_sources: []
---

# Synology DSM: OTP alternate path lets attackers bypass login, read or write files

Link for people: https://infrastack.ai/live/CVE-2026-18596 (this .md is for agents)

Synology DiskStation Manager has an authentication bypass in its one-time password (OTP) handling that uses an alternate path. A remote attacker who already holds a valid user's credentials can read or write arbitrary files and cause denial of service.

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

## Affected

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

## How to check

- Check the installed DSM version in Control Panel > Info Center; compare against the fixed versions below.

## Fix

- DSM before `7.3.2-86009-5` is affected; move to `7.3.2-86009-5` or later.
- DSM before `7.4.1-90080-1` is affected; move to `7.4.1-90080-1` or later.

## Timeline

- 2026-11-12T04:47:09+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-18596

## From the sources

An authentication bypass using an alternate path or channel vulnerability in the OTP in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1 allows remote attackers with valid user credentials to read or write arbitrary files and conduct denial-of-service attacks.

---

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