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CVE-2023-40440 - macOS
#1 · 11. September 2023, 0:00
This issue was addressed with improved state management of S/MIME encrypted emails. This issue is fixed in macOS Monterey 12.6.8. A S/MIME encrypted email may be inadvertently sent unencrypted.
References
https://support.apple.com/en-us/HT213844