CVE-2026-19820

HighCVSS 7.8/10Last modified Sep 11, 2026

Description

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.

Metrics

CVSS 4.0 7.8/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weakness enumeration

CWE-59

Affected software

Vendor	Product	Versions
Backblaze	Backblaze Client	10.0.0.1029; 10.0.1.1037; 10.0.2.1047

References

Timeline

Published: Sep 1, 2026
Last modified: Sep 11, 2026
NVD status: Deferred

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