VULNERABILITY INTELLIGENCE
CVE-2026-19820
CVSS score5.8 MEDIUM
EPSS probability0.49%
CISA KEVNot currently listed
Published2026-09-01
Last modified2026-09-11
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:L
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.
Weakness classification
- CWE-59: Improper Link Resolution Before File Access ('Link Following')