# CVE-2026-15201: Synology DiskStation Manager improper certificate validation in Support Form

Source: https://junglewise.ai/threats/cve-2026-15201-an-improper-certificate-validation-vulnerability-in-the-support  
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-2026-15201 · Severity: medium · CVSS 5.9 · Published 2026-11-12

Synology DiskStation Manager is a storage appliance operating system used to manage network-attached storage devices. An improper certificate validation flaw in the Support Form component allows attackers positioned on the network to intercept communications and read or write files during support submissions, potentially compromising stored data and system integrity.

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

## Quick answers

**Is CVE-2026-15201 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15201 being exploited in the wild.

**How severe is CVE-2026-15201?** Medium severity, with a CVSS score of 5.9, published 12 November 2026.

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

**Is there a fix for CVE-2026-15201?** Yes: fixed in DSM 7.3.2-86009-5, 7.4.1-90080-1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-15201 attacked?** It is attacked over the network or from the adjacent network, in a network appliance.

**Am I affected by CVE-2026-15201?** 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

## Technical details

The Support Form component in DSM fails to properly validate TLS/SSL certificates, enabling man-in-the-middle (MITM) attacks over the network. An attacker on the network path can intercept support form submissions, read arbitrary files sent as part of the submission, and write specific files to the system. No authentication is required from the attacker, though the victim must be submitting a support form.

## Affected products

- Synology DiskStation Manager 7.3.x before 7.3.2-86009-5; 7.4.x before 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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