An issue existed in the handling of snapshots. The issue was resolved with improved permissions logic. This issue is fixed in macOS Big Sur 11.0.1. A malicious application may be able to preview files it does not have access to.
Link | Tags |
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https://support.apple.com/en-us/HT211931 | vendor advisory |
http://seclists.org/fulldisclosure/2020/Dec/32 | third party advisory mailing list |