{"id":"CVE-2020-8289","aliases":["EUVD-2020-29157","GHSA-7f55-fqw6-8jjp"],"status":"published","title":"Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434 suffer from...","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.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.04696,"percentile":0.91873,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-295"],"published":"2020-12-27T01:20:50Z","modified":"2026-06-17T03:26:13Z","exploits":[{"source":"pocgithub","id":"geffner/CVE-2020-8289","title":"geffner/CVE-2020-8289","date":"2020-09-09","url":"https://github.com/geffner/CVE-2020-8289"}],"products":[{"vendor":"backblaze","product":"backblaze"}],"references":[{"url":"https://hackerone.com/reports/818853","tags":["x_refsource_MISC","x_transferred","Permissions Required"]},{"url":"https://youtu.be/W0THXbcX5V8","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://github.com/geffner/CVE-2020-8289/blob/master/README.md","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2020/Dec/57","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Mailing List","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2020/Dec/58","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Mailing List","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-8289"},{"url":"https://github.com/advisories/GHSA-7f55-fqw6-8jjp"}],"sources":{"cve":[{"id":"CVE-2020-8289","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.","status":"published","published":"2020-12-27T01:20:50Z","modified":"2024-08-04T09:56:28.315Z","cwes":["CWE-295"],"updated_at":"2026-11-02T14:35:50.88562Z"}],"euvd":[{"id":"EUVD-2020-29157","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.","status":"published","published":"2020-12-27T01:20:50Z","modified":"2024-08-04T09:56:28Z","updated_at":"2026-11-03T03:07:57.599144Z"}],"ghsa":[{"id":"GHSA-7f55-fqw6-8jjp","title":"Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434 suffer from...","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.","status":"published","published":"2022-05-24T17:37:30Z","modified":"2023-01-29T05:05:12Z","cwes":["CWE-295"],"updated_at":"2026-11-02T14:45:43.934947Z"}],"nvd":[{"id":"CVE-2020-8289","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.","status":"published","published":"2020-12-27T02:15:14.48Z","modified":"2026-06-17T03:26:13.83Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":9.3,"vector":"AV:N/AC:M/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:06:28.340168Z"}]}}