CVE-2020-8290

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.

• CWE-269
• CWE-269

• https://github.com/geffner/CVE-2020-8290/blob/master/README.mdExploit, Third Party Advisory
• https://hackerone.com/reports/818857Permissions Required
• https://youtu.be/OpC6neWd2aMExploit, Third Party Advisory
• https://github.com/geffner/CVE-2020-8290/blob/master/README.mdExploit, Third Party Advisory
• https://hackerone.com/reports/818857Permissions Required
• https://youtu.be/OpC6neWd2aMExploit, 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-2020-8284A 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-2020-8289Backblaze for Windows before 7.0.1.433 and Backblaze for mac…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
• CVE-2020-8296Nextcloud Server prior to 20.0.0 stores passwords in a recov…6.7