CVE-2020-28940: Westerndigital My Cloud OS 5

Critical severity, CVSS 9.8. EPSS: 3.9% chance of exploitation in the next 30 days.

On Western Digital My Cloud OS 5 devices before 5.06.115, the NAS Admin dashboard has an authentication bypass vulnerability that could allow an unauthenticated user to execute privileged commands on the device.

Affected products

• Westerndigital My Cloud OS 5: before 5.06.115 (fixed in 5.06.115)

Published 2020-12-01. Last modified 2026-06-17.