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CVE-2026-19820: Backblaze Client for Windows Improper Link Resolution Vulnerability

• Severity: high (CVSS 7.8 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-01 · updated 2026-09-11
• Weakness: CWE-59

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.

Affected products

• Backblaze Client: 10.0.0.1029, 10.0.1.1037, 10.0.2.1047

References

• https://www.backblaze.com/computer-backup/docs/backup-client-release-notes-windows
• https://www.backblaze.com/status/update

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