CVE-2023-0547: Mozilla Thunderbird

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Mozilla Thunderbird: from 68.0, before 102.10 (fixed in 102.10)

Published 2023-06-02. Last modified 2026-06-17.