CVE-2026-19820Backblaze Client for Windows Improper Link Resolution Vulnerability
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.8 MEDIUM (v4.0, CNA)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
- Weakness (CWE)
- CWE-59
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Bugcrowd
- NVD analysis
- Deferred
- Record last updated
- Sep 10, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Backblaze Backblaze Client backblaze:client (from the name) | 10.0.0.1029; 10.0.1.1037; 10.0.2.1047 | CNA record |
References
- https://www.backblaze.com/computer-backup/docs/backup-client-release-notes-windows
- https://www.backblaze.com/status/update
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.