{"id":"CVE-2021-30817","aliases":["EUVD-2021-17734","GHSA-363f-7q84-2cr6"],"status":"published","title":"A permissions issue was addressed with improved validation. This issue is fixed in macOS Big Sur...","description":"A permissions issue was addressed with improved validation. This issue is fixed in macOS Big Sur 11.5. A malicious application may be able to access data about the accounts the user is using Family Sharing with.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00634,"percentile":0.5086,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-10-28T18:17:10Z","modified":"2026-06-17T03:50:56Z","products":[{"vendor":"apple","product":"macos"}],"references":[{"url":"https://support.apple.com/en-us/HT212602","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-30817"},{"url":"https://github.com/advisories/GHSA-363f-7q84-2cr6"}],"sources":{"cve":[{"id":"CVE-2021-30817","description":"A permissions issue was addressed with improved validation. This issue is fixed in macOS Big Sur 11.5. A malicious application may be able to access data about the accounts the user is using Family Sharing with.","status":"published","published":"2021-10-28T18:17:10Z","modified":"2024-08-03T22:48:12.675Z","updated_at":"2026-11-02T14:33:01.852999Z"}],"euvd":[{"id":"EUVD-2021-17734","description":"A permissions issue was addressed with improved validation. This issue is fixed in macOS Big Sur 11.5. A malicious application may be able to access data about the accounts the user is using Family Sharing with.","status":"published","published":"2021-10-28T18:17:10Z","modified":"2024-08-03T22:48:12Z","updated_at":"2026-11-03T03:24:41.017854Z"}],"ghsa":[{"id":"GHSA-363f-7q84-2cr6","title":"A permissions issue was addressed with improved validation. This issue is fixed in macOS Big Sur...","description":"A permissions issue was addressed with improved validation. This issue is fixed in macOS Big Sur 11.5. A malicious application may be able to access data about the accounts the user is using Family Sharing with.","status":"published","published":"2022-05-24T19:19:01Z","modified":"2023-01-30T05:03:29Z","updated_at":"2026-11-02T14:46:50.963031Z"}],"nvd":[{"id":"CVE-2021-30817","description":"A permissions issue was addressed with improved validation. This issue is fixed in macOS Big Sur 11.5. A malicious application may be able to access data about the accounts the user is using Family Sharing with.","status":"published","published":"2021-10-28T19:15:08.947Z","modified":"2026-06-17T03:50:56.767Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:07:00.549994Z"}]}}