VulnerabilityModified

CVE-2020-8289

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…

HIGH 7.8EPSS 4.70%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (4.70%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

CVSS 3.1: 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS: 4.70% probability · 92th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-295
Affected: backblaze/backblaze
Source: support@hackerone.com

EPSS trend

EPSS 4.7% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

http://seclists.org/fulldisclosure/2020/Dec/57Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2020/Dec/58Mailing List, Third Party Advisory
https://github.com/geffner/CVE-2020-8289/blob/master/README.mdExploit, Third Party Advisory
https://hackerone.com/reports/818853Permissions Required
https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/Third Party Advisory
https://youtu.be/W0THXbcX5V8Exploit, Third Party Advisory
http://seclists.org/fulldisclosure/2020/Dec/57Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2020/Dec/58Mailing List, Third Party Advisory
https://github.com/geffner/CVE-2020-8289/blob/master/README.mdExploit, Third Party Advisory
https://hackerone.com/reports/818853Permissions Required
https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/Third Party Advisory
https://youtu.be/W0THXbcX5V8Exploit, Third Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.