Vulnerability in Backblaze Client
CVE-2026-19820
A vulnerability in the Backblaze Client allows a local user to make the system not bootable by creating a link from Backblaze's folder to Windows OS system files during a backup. Successful exploitation requires an administrator-level system change that results in the absence of specific Windows OS security controls. This vulnerability is due to improper link resolution.
Affected products
- Backblaze Client — versions 10.0.0.1029, 10.0.1.10307, 10.0.2.1047