CVE-2018-9148: Westerndigital My Cloud Firmware

Critical severity, CVSS 9.8. EPSS: 3.6% chance of exploitation in the next 30 days.

Western Digital WD My Cloud v04.05.00-320 devices embed the session token (aka PHPSESSID) in filenames, which makes it easier for attackers to bypass authentication by listing a directory. NOTE: this can be exploited in conjunction with CVE-2018-7171 for remote authentication bypass within a product that uses My Cloud.

Affected products

Published 2018-03-30. Last modified 2026-06-17.