Synology DiskStation Manager up to 7.2.0/7.2.2-72806-6/7.3.2-86009-1 Desktop API path traversal

Summaryinfo

A vulnerability was found in Synology DiskStation Manager up to 7.2.0/7.2.2-72806-6/7.3.2-86009-1. It has been rated as critical. The affected element is an unknown function of the component Desktop API. The manipulation leads to path traversal. This vulnerability is referenced as CVE-2026-40535. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Synology DiskStation Manager up to 7.2.0/7.2.2-72806-6/7.3.2-86009-1 and classified as critical. This issue affects an unknown function of the component Desktop API. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is integrity, and availability. The summary by CVE is:

An improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Desktop API in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows remote attackers to write limited files and conduct limited denial-of-service attacks.

It is possible to read the advisory at synology.com. The identification of this vulnerability is CVE-2026-40535 since 04/14/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 7.2.1-69057-10, 7.2.2-72806-7 or 7.3.2-86009-2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-82795). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Network Attached Storage Software

Vendor

• Synology

Name

• DiskStation Manager

Version

• 7.0
• 7.1
• 7.2.0
• 7.2.2-72806-6
• 7.3.2-86009-1

License

• commercial

Website

• Vendor: https://www.synology.com/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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