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 execution via client update functionality.

• CWE-295
• CWE-295

• 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

Published

Dec 27, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2020-8283An authorised user on a Windows host running Citrix Universa…8.8
• CVE-2020-8284A malicious server can use the FTP PASV response to trick cu…3.7
• CVE-2020-8285curl 7.21.0 to and including 7.73.0 is vulnerable to uncontr…7.5
• CVE-2020-8286curl 7.41.0 through 7.73.0 is vulnerable to an improper chec…7.5
• CVE-2020-8287Node.js versions before 10.23.1, 12.20.1, 14.15.4, 15.5.1 al…6.5
• CVE-2020-8288The `specializedRendering` function in Rocket.Chat server be…5.4
• CVE-2020-8290Backblaze for Windows and Backblaze for macOS before 7.0.0.4…7.8
• CVE-2020-8291A link preview rendering issue in Rocket.Chat versions befor…6.1
• CVE-2020-8292Rocket.Chat server before 3.9.0 is vulnerable to a self cros…5.4
• CVE-2020-8293A missing input validation in Nextcloud Server before 20.0.2…6.5
• CVE-2020-8294A missing link validation in Nextcloud Server before 20.0.2,…5.4
• CVE-2020-8295A wrong check in Nextcloud Server 19 and prior allowed to pe…7.5