# CVE-2026-18792: Synology DiskStation Manager path traversal in Sharing API

Source: https://junglewise.ai/threats/cve-2026-18792-an-improper-limitation-of-a-pathname-to-a-restricted-directory  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-12. Updated: 2026-11-12  
License: CC BY 4.0 with a link back

CVE-2026-18792 · Severity: high · CVSS 8.8 · Published 2026-11-12

Synology DiskStation Manager (DSM) is a network-attached storage management system that allows users to store and share files. This vulnerability allows authenticated users to bypass directory restrictions in the Sharing API, enabling them to read, modify, or delete arbitrary files on the storage system and cause service outages.

Technologies: [Synology DiskStation Manager](https://junglewise.ai/threats/technologies/diskstation-manager). Vendors: [Synology](https://junglewise.ai/threats/vendors/synology).

## Quick answers

**Is CVE-2026-18792 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-18792 being exploited in the wild.

**How severe is CVE-2026-18792?** High severity, with a CVSS score of 8.8, published 12 November 2026.

**Which products and versions are affected?** Synology DiskStation Manager before 7.3.2-86009-5 and 7.4.1-90080-1.

**Is there a fix for CVE-2026-18792?** Yes: fixed in DSM 7.3.2-86009-5, 7.4.1-90080-1 or above. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-18792 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-18792?** Check whether you run Synology DiskStation Manager at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in DSM 7.3.2-86009-5, 7.4.1-90080-1 or above

## Technical details

An improper pathname validation vulnerability (CWE-22) in the Sharing API allows remote authenticated users to conduct path traversal attacks and access files outside restricted directories. The vulnerability affects DSM versions before 7.3.2-86009-5 and 7.4.1-90080-1, requires valid user authentication, and allows full read/write access with potential for denial-of-service via file operations.

## Affected products

- Synology DiskStation Manager before 7.3.2-86009-5 and 7.4.1-90080-1

## Timeline

- 2026-11-10: disclosed
- 2026-11-12: advisory

## References

- [https://www.synology.com/en-global/security/advisory/Synology_SA_26_18](https://www.synology.com/en-global/security/advisory/Synology_SA_26_18)

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