# CVE-2026-19414: Synology DiskStation Manager missing authorization in Promotion API

Source: https://junglewise.ai/threats/cve-2026-19414-a-missing-authorization-vulnerability-in-the-promotion-api-in  
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-2026-19414 · Severity: medium · CVSS 4.3 · Published 2026-11-12

Synology DiskStation Manager is the operating system for network-attached storage devices used by businesses to manage files and backups. A missing authorization flaw in the Promotion API allows authenticated users to write files they should not be able to access, potentially enabling unauthorized modifications to system configuration or data.

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

## Quick answers

**Is CVE-2026-19414 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-19414 being exploited in the wild.

**How severe is CVE-2026-19414?** Medium severity, with a CVSS score of 4.3, published 12 November 2026.

**Which products and versions are affected?** Synology DiskStation Manager 7.3 before 7.3.2-86009-5, 7.4 before 7.4.1-90080-1.

**Is there a fix for CVE-2026-19414?** 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-2026-19414 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-19414?** 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

A missing authorization vulnerability in the Promotion API allows remote authenticated users to write specific files without proper access controls. The vulnerability requires prior authentication and network access. An attacker with valid credentials can bypass authorization checks to write arbitrary files, potentially compromising system integrity.

## Affected products

- Synology DiskStation Manager 7.3 before 7.3.2-86009-5, 7.4 before 7.4.1-90080-1

## Timeline

- 2026-11-10: disclosed

## 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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