Zitat von MITs Forum am 2. Juni 2023, 0:00 Uhr

OCSP revocation status of recipient certificates was not checked when sending S/Mime encrypted email, and revoked certificates would be accepted. Thunderbird versions from 68 to 102.9.1 were affected by this bug. This vulnerability affects Thunderbird < 102.10.

References
https://bugzilla.mozilla.org/show_bug.cgi?id=1811298
https://www.mozilla.org/security/advisories/mfsa2023-15/