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CVE-2020-8290

HIGH
7.8
CVSS Score
Published: December 27, 2020 at 01:22 AM UTC
Updated: June 17, 2026 at 03:26 AM UTC
1 product affected across 1 vendorBackblaze

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Severity
HIGH7.8
Exploit prediction
EPSS 0.6%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Backblaze· Backblaze
95%
v < 7.0.0.439
Affected range stops below 7.0.0.439, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://github.com/geffner/CVE-2020-8290/blob/master/README.md
x_refsource_MISCPermissions Required
Source: [email protected]
https://hackerone.com/reports/818857
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://youtu.be/OpC6neWd2aM

CVSS

7.8HIGH[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-269

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