CVE-2020-8290

HighCVSS 7.8/10Last modified Jun 17, 2026

Description

Backblaze for Windows and Backblaze for macOS before 7.0.0.439 suffer from improper privilege management in `bztransmit` helper due to lack of permission handling and validation before creation of client update directories allowing for local escalation of privilege via rogue client update binary.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-269

Affected software

Vendor	Product	Versions
n/a	Backblaze	Prior to 7.0.0.439

References

https://github.com/geffner/CVE-2020-8290/blob/master/README.mdExploit, Third Party Advisory
https://hackerone.com/reports/818857Permissions Required
https://youtu.be/OpC6neWd2aMExploit, Third Party Advisory
https://github.com/geffner/CVE-2020-8290/blob/master/README.mdExploit, Third Party Advisory
https://hackerone.com/reports/818857Permissions Required
https://youtu.be/OpC6neWd2aMExploit, Third Party Advisory

Timeline

Published: Dec 27, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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