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CVE-2026-19820

Backblaze Client for Windows Improper Link Resolution Vulnerability

CVSS 4.0 5.8 MEDIUMCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-19820

Published

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.

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Affected versions, risk and source history

Related advisories and sources

Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.

CVE-2026-19820 · CVE overview and exploitation status

cve-program · CVE-2026-19820

Related changes

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Sources read 15 Nov 01:41 UTC · 255 of 275 readable · 253 fully read · documentation 469/469 current

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