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CVE-2026-19820

Backblaze Client for Windows Improper Link Resolution Vulnerability

MEDIUM
5.8
CVSS Score
Published: September 1, 2026 at 12:13 AM UTC
Updated: September 11, 2026 at 12:17 AM UTC
1 product affected across 1 vendorBackblaze Client

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Severity
MEDIUM5.8
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

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

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.8MEDIUMBugcrowd
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-59

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