{"id":"CVE-2020-8289","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-8289","generatedAt":"2026-10-28T06:34:52.032Z","title":"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…","description":"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.","published":"2020-12-27T02:15:14.000Z","lastModified":"2026-06-17T03:26:14.000Z","status":"Modified","sourceIdentifier":"support@hackerone.com","cvss":{"version":"3.1","score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"cwe":["CWE-295"],"affected":["backblaze/backblaze"],"epss":{"score":0.04696,"percentile":0.9175,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"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."},"changes":[],"references":[{"url":"http://seclists.org/fulldisclosure/2020/Dec/57","tags":["Mailing List","Third Party Advisory"],"source":"support@hackerone.com"},{"url":"http://seclists.org/fulldisclosure/2020/Dec/58","tags":["Mailing List","Third Party Advisory"],"source":"support@hackerone.com"},{"url":"https://github.com/geffner/CVE-2020-8289/blob/master/README.md","tags":["Exploit","Third Party Advisory"],"source":"support@hackerone.com"},{"url":"https://hackerone.com/reports/818853","tags":["Permissions Required"],"source":"support@hackerone.com"},{"url":"https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/","tags":["Third Party Advisory"],"source":"support@hackerone.com"},{"url":"https://youtu.be/W0THXbcX5V8","tags":["Exploit","Third Party Advisory"],"source":"support@hackerone.com"},{"url":"http://seclists.org/fulldisclosure/2020/Dec/57","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://seclists.org/fulldisclosure/2020/Dec/58","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/geffner/CVE-2020-8289/blob/master/README.md","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://hackerone.com/reports/818853","tags":["Permissions Required"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://youtu.be/W0THXbcX5V8","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-8289","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}