Synology DiskStation Manager up to 7.3.1/7.3.2-86009-4/7.4.1-90080-0 Sharing API path traversal

Summaryinfo

A vulnerability has been found in Synology DiskStation Manager up to 7.3.1/7.3.2-86009-4/7.4.1-90080-0 and classified as very critical. This affects an unknown part of the component Sharing API. The manipulation leads to path traversal. This vulnerability is traded as CVE-2026-18792. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Synology DiskStation Manager up to 7.3.1/7.3.2-86009-4/7.4.1-90080-0. It has been rated as very critical. This issue affects an unknown part of the component Sharing 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 confidentiality, integrity, and availability. The summary by CVE is:

An improper limitation of a pathname to a restricted directory vulnerability in the Sharing API 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.

The advisory is shared at synology.com. The identification of this vulnerability is CVE-2026-18792 since 08/04/2026. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/12/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 7.3.2-86009-5 or 7.4.1-90080-1 eliminates this vulnerability.

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Productinfo

Type

• Network Attached Storage Software

Vendor

• Synology

Name

• DiskStation Manager

Version

• 7.0
• 7.1
• 7.2
• 7.3
• 7.3.0
• 7.3.1
• 7.3.2-86009-4
• 7.4.1-90080-0

License

• commercial

Website

• Vendor: https://www.synology.com/

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