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.
Published: 2026-09-01
Score: 5.8 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 02 Sep 2026 00:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-269
CWE-272

Tue, 01 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-59
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 01 Sep 2026 12:45:00 +0000

Type Values Removed Values Added
First Time appeared Backblaze
Backblaze backblaze
Vendors & Products Backblaze
Backblaze backblaze

Tue, 01 Sep 2026 01:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-269
CWE-272

Tue, 01 Sep 2026 00:45:00 +0000

Type Values Removed Values Added
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.
Title Backblaze Client for Windows Improper Link Resolution Vulnerability
References
Metrics cvssV4_0

{'score': 5.8, 'vector': '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'}


Subscriptions

Backblaze Backblaze
cve-icon MITRE

Status: PUBLISHED

Assigner: Bugcrowd

Published:

Updated: 2026-09-01T15:14:13.872Z

Reserved: 2026-08-14T05:28:19.979Z

Link: CVE-2026-19820

cve-icon Vulnrichment

Updated: 2026-09-01T15:13:48.599Z

cve-icon NVD

Status : Received

Published: 2026-09-01T01:16:33.137

Modified: 2026-09-01T16:16:55.223

Link: CVE-2026-19820

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-02T05:00:13Z

Weaknesses