---
id: CVE-2026-13623
title: >-
  An improper neutralization of input during web page generation ('Cross-site
  Scripting') vulnerability in Theme API in Synology DiskStation Manager (DSM)
  before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4 and 7.4-90075 allows
  remote auth…
summary: >-
  An improper neutralization of input during web page generation ('Cross-site
  Scripting') vulnerability in Theme API in Synology DiskStation Manager (DSM)
  before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4 and 7.4-90075 allows
  remote auth…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: Synology
product: DiskStation Manager (DSM)
affected:
  - diskstation_manager_dsm >= 7.4 < 7.4-90075
  - diskstation_manager_dsm >= 7.3.2 < 7.3.2-86009-4
  - diskstation_manager_dsm >= 7.2.2 < 7.2.2-72806-9
  - diskstation_manager_dsm >= 7.2.1 < 7.2.1-69057-12
published: '2026-09-18'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T19:07:38.320'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-13623'
references:
  - url: 'https://www.synology.com/en-global/security/advisory/Synology_SA_26_13'
    label: security@synology.com
tags:
  - nvd
  - cve.org
epss: 0.00249
epssPercentile: 0.14458
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T11:25:43.969447Z'
ingestedAt: '2026-09-18T08:38:04.114Z'
---

## Overview

An improper neutralization of input during web page generation ('Cross-site Scripting') vulnerability in Theme API in Synology DiskStation Manager (DSM) before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4 and 7.4-90075 allows remote authenticated users with administrator privileges to read or write limited files.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.