{"id":"CVE-2020-28970","aliases":["EUVD-2020-21355","GHSA-53g2-3hfr-5746"],"status":"published","title":"An issue was discovered on Western Digital My Cloud OS 5 devices before 5.06.115. A NAS Admin...","description":"An issue was discovered on Western Digital My Cloud OS 5 devices before 5.06.115. A NAS Admin authentication bypass vulnerability could allow an unauthenticated user to execute privileged commands on the device via a cookie. (In addition, an upload endpoint could then be used by an authenticated administrator to upload executable PHP scripts.)","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.03944,"percentile":0.90494,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287"],"published":"2020-12-01T15:32:12Z","modified":"2026-06-17T03:10:55Z","products":[{"vendor":"westerndigital","product":"my_cloud_os_5"}],"references":[{"url":"https://support.wdc.com/downloads.aspx?g=907\u0026lang=en#downloads","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://www.westerndigital.com/support/productsecurity/wdc-20009-os5-firmware-5-06-115","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-20-1448/","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","VDB Entry"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-28970"},{"url":"https://github.com/advisories/GHSA-53g2-3hfr-5746"}],"sources":{"cve":[{"id":"CVE-2020-28970","description":"An issue was discovered on Western Digital My Cloud OS 5 devices before 5.06.115. A NAS Admin authentication bypass vulnerability could allow an unauthenticated user to execute privileged commands on the device via a cookie. (In addition, an upload endpoint could then be used by an authenticated administrator to upload executable PHP scripts.)","status":"published","published":"2020-12-01T15:32:12Z","modified":"2024-08-04T16:48:01.191Z","updated_at":"2026-11-02T14:35:57.352161Z"}],"euvd":[{"id":"EUVD-2020-21355","description":"An issue was discovered on Western Digital My Cloud OS 5 devices before 5.06.115. A NAS Admin authentication bypass vulnerability could allow an unauthenticated user to execute privileged commands on the device via a cookie. (In addition, an upload endpoint could then be used by an authenticated administrator to upload executable PHP scripts.)","status":"published","published":"2020-12-01T15:32:12Z","modified":"2024-08-04T16:48:01Z","updated_at":"2026-11-03T03:07:08.475588Z"}],"ghsa":[{"id":"GHSA-53g2-3hfr-5746","title":"An issue was discovered on Western Digital My Cloud OS 5 devices before 5.06.115. A NAS Admin...","description":"An issue was discovered on Western Digital My Cloud OS 5 devices before 5.06.115. A NAS Admin authentication bypass vulnerability could allow an unauthenticated user to execute privileged commands on the device via a cookie. (In addition, an upload endpoint could then be used by an authenticated administrator to upload executable PHP scripts.)","status":"published","published":"2022-05-24T17:35:14Z","modified":"2023-01-29T05:04:53Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:45:39.783328Z"}],"nvd":[{"id":"CVE-2020-28970","description":"An issue was discovered on Western Digital My Cloud OS 5 devices before 5.06.115. A NAS Admin authentication bypass vulnerability could allow an unauthenticated user to execute privileged commands on the device via a cookie. (In addition, an upload endpoint could then be used by an authenticated administrator to upload executable PHP scripts.)","status":"published","published":"2020-12-01T16:15:10.94Z","modified":"2026-06-17T03:10:55.633Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:06:25.394006Z"}]}}