CVE-2026-19820

UNKNOWN 0.0

Backblaze Client for Windows Improper Link Resolution Vulnerability

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	backblaze
Product	backblaze client
Published	Sep 1, 2026

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Affected Versions

Backblaze / Backblaze Client

10.0.0.1029 10.0.1.10307 10.0.2.1047

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

TrendAI Zero Day Initiative hamdi