---
id: "CVE-2026-13672"
page: "https://infrastack.ai/live/CVE-2026-13672"
kind: "vulnerability"
aliases: ["CVE-2026-13672"]
title: "Synology DSM: SSO login flaw lets users read or write arbitrary files"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["dsm", "infrastructure", "nas", "self-hosted", "synology"]
not_affected_if: ["fixed-version", "no-untrusted-accounts"]
published_at: "2026-11-12T04:17:18+00:00"
first_seen_at: "2026-11-12T04:47:08+00:00"
updated_at: "2026-11-12T04:47:36+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-13672", "first_seen_at": "2026-11-12T04:47:08+00:00"}]
exploit_sources: []
---

# Synology DSM: SSO login flaw lets users read or write arbitrary files

Link for people: https://infrastack.ai/live/CVE-2026-13672 (this .md is for agents)

An authorization bypass in the SSOAuth component of Synology DiskStation Manager lets a logged-in user read or write files they should not reach, and cause denial of service. The flaw is in how user-controlled keys are handled during SSO authentication.

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

## How to check

- Check the DSM version in Control Panel > Info Center; compare it against `7.3.2-86009-5` and `7.4.1-90080-1`
- Confirm whether SSO single sign-on (SSOAuth) is enabled in the DSM configuration

## Fix

- DSM 7.3.x: move to `7.3.2-86009-5` or later
- DSM 7.4.x: move to `7.4.1-90080-1` or later

## Timeline

- 2026-11-12T04:47:08+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-13672

## From the sources

An authorization bypass through user-controlled key vulnerability in the SSOAuth in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1 allows remote authenticated users 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_