CVE-2026-19820
5.8
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:L
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Backblaze | Backblaze Client | 10.0.0.1029 | affected |
| Backblaze | Backblaze Client | 10.0.1.10307 | affected |
| Backblaze | Backblaze Client | 10.0.2.1047 | affected |
Weaknesses
- CWE-59 Improper Link Resolution Before File Access
References
- https://www.backblaze.com/computer-backup/docs/backup-client-release-notes-windows
- https://www.backblaze.com/status/update
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