CVE-2020-8290
Backblaze for Windows and Backblaze for macOS before 7.0.0.439 suffer from improper privilege...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2020-8290- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 4.6 Medium
AV:L/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-269
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2020-8290- Weakness
- CWE-269
- Updated
- 2026-11-02
EUVDEUVD-2020-29158 No score
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.
- Record
EUVD-2020-29158- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-mfc8-4qmg-g3x6 No score
Backblaze for Windows and Backblaze for macOS before 7.0.0.439 suffer from improper privilege...
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.
- Record
GHSA-mfc8-4qmg-g3x6- Weakness
- CWE-269
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | geffner/CVE-2020-8290 | 2020-09-09 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-8290 is a high vulnerability (CVSS 7.8) in Backblaze, published December 27, 2020. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.59%, the 48th percentile. No source names a fixed version.