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  4. CVE 2026 19820 backblaze client for windows improper link
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Back to active CVEs
Medium · CVSS 7.8CVE-2026-19820

Backblaze Client for Windows Improper Link Resolution VulnerabilityCVE-2026-19820

Answer in brief

CVE-2026-19820 records a Medium severity (CVSS 7.8) vulnerability in Backblaze Client for Windows Improper Link Resolution Vulnerability. The current sources do not mark it as known exploited. The current feed maps Backblaze/Backblaze Client (generic), Backblaze/Backblaze Client (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 1, 2026Updated Sep 11, 2026Source checked Oct 17, 2026First seen by HOL Sep 1, 2026Material review Sep 11, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Backblaze/Backblaze Client (generic), Backblaze/Backblaze Client (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Backblaze/Backblaze Clientgeneric10.0.0.1029 || 10.0.1.1037 || 10.0.2.1047Not reported
Backblaze/Backblaze Clientgeneric10.0.0.1029 || 10.0.1.10307 || 10.0.2.1047Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Backblaze/Backblaze Client, Backblaze/Backblaze Client.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Sep 1, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 1, 2026

Sources and claim methodology

  • Source referencebackblaze.com
  • Source referencebackblaze.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Nautilus: nautilus: arbitrary file deletion via trash symlinkAlso CWE-59
  • ZoneMinder: Authenticated OS Command Injection (RCE) via Export FeatureSame generic ecosystem
  • ZoneMinder: Authenticated OS Command Injection via unsanitized Monitor Name in event export (download_functions.php)Same generic ecosystem
  • JavaCV: Integer Overflow in IPCameraFrameGrabber Causes Infinite-Loop DoSSame generic ecosystem
  • LoopX serve-status permissive CORS policy exposes control-plane state and private Markdown filesSame generic ecosystem
  • ERPNext: Unauthorised access to financial data due to missing validationSame generic ecosystem

Record context

Vulnerability class
Path Traversal
EPSS
Not reported
CWE IDs
CWE-59
Source
CVE List V5
Source checked
Oct 17, 2026
References
2 linked sources
Open source record