CVE-2020-8289

7.8 highEPSS 4.7%

High (7.8) in backblaze backblaze. EPSS 4.7% chance of exploitation in the next 30 days.

Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434 suffer from improper certificate validation in `bztransmit` helper due to hardcoded whitelist of strings in URLs where validation is disabled leading to possible remote code execution via client update functionality.

Severity

CVSS 3.1

7.8 high

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

EPSS: 4.7% chance of exploitation in the next 30 days; higher than 91% of CVEs (scores of 2026-10-31)
CWE: CWE-295
Published: 2020-12-27
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

backblaze:backblaze

References

http://seclists.org/fulldisclosure/2020/Dec/57
http://seclists.org/fulldisclosure/2020/Dec/58
https://github.com/geffner/CVE-2020-8289/blob/master/README.md
https://hackerone.com/reports/818853
https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/

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