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

Quick assessment

Affected
Backblaze Backblaze Client
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Backblaze Client是美国Backblaze公司的一款提供云端备份服务的客户端软件。 Backblaze Client 10.0.0.1029版本、10.0.1.10307版本和10.0.2.1047版本存在后置链接漏洞，该漏洞源于链接解析不当，可能导致本地用户在备份期间创建从Backblaze文件夹到Windows OS系统文件的链接，使系统无法启动。

CVSS 5.8 · Medium EPSS 0.33% · P26

Affected Version Matrix 3

VendorProduct Version RangeStatus
Backblaze Backblaze Client 10.0.0.1029 affected
10.0.1.10307 affected
10.0.2.1047 affected
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I. Basic Information for CVE-2026-19820

Vulnerability Information
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Vulnerability Title
Backblaze Client for Windows Improper Link Resolution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Backblaze Client 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Backblaze Client是美国Backblaze公司的一款提供云端备份服务的客户端软件。 Backblaze Client 10.0.0.1029版本、10.0.1.10307版本和10.0.2.1047版本存在后置链接漏洞，该漏洞源于链接解析不当，可能导致本地用户在备份期间创建从Backblaze文件夹到Windows OS系统文件的链接，使系统无法启动。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Backblaze Backblaze Client 10.0.0.1029 -

II. Public POCs for CVE-2026-19820

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III. Intelligence Information for CVE-2026-19820

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Vendor Pages for CVE-2026-19820 (2)

IV. Related Vulnerabilities

Same vendor: Backblaze

V. Comments for CVE-2026-19820

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