# CVE-2026-85101: Synology DiskStation Manager authentication bypass in rsync

Source: https://junglewise.ai/threats/cve-2026-85101-an-authentication-bypass-using-an-alternate-path-or-channel  
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-2026-85101 · Severity: high · CVSS 8.6 · Published 2026-11-12

Synology DiskStation Manager is network storage management software used by organizations to control NAS appliances. An authentication bypass vulnerability in the rsync component allows remote attackers without credentials to read files, write arbitrary files, and cause service disruption on affected systems.

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

## Quick answers

**Is CVE-2026-85101 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-85101 being exploited in the wild.

**How severe is CVE-2026-85101?** High severity, with a CVSS score of 8.6, published 12 November 2026.

**Which products and versions are affected?** Synology DiskStation Manager 7.2.1 before 69057-13, 7.2.2 before 72806-10, 7.3.2 before 86009-5, 7.4.1 before 90080-1.

**Is there a fix for CVE-2026-85101?** Yes: fixed in DSM 7.2.1-69057-13 or above, 7.2.2-72806-10 or above, 7.3.2-86009-5 or above, 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-2026-85101 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-85101?** 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 7.2.1-69057-13 or above, 7.2.2-72806-10 or above, 7.3.2-86009-5 or above, 7.4.1-90080-1 or above

## Technical details

An authentication bypass vulnerability in the rsync component allows remote attackers to bypass authentication checks and perform unauthorized operations. The vulnerability requires network access but no credentials or user interaction; attackers can read specific files, write arbitrary files, and conduct limited denial-of-service attacks against the storage system.

## Affected products

- Synology DiskStation Manager 7.2.1 before 69057-13, 7.2.2 before 72806-10, 7.3.2 before 86009-5, 7.4.1 before 90080-1

## Timeline

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

## References

- [https://www.synology.com/en-global/security/advisory/Synology_SA_26_19](https://www.synology.com/en-global/security/advisory/Synology_SA_26_19)

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