CVE-2023-0430: Mozilla Thunderbird

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

Certificate OCSP revocation status was not checked when verifying S/Mime signatures. Mail signed with a revoked certificate would be displayed as having a valid signature. Thunderbird versions from 68 to 102.7.0 were affected by this bug. This vulnerability affects Thunderbird < 102.7.1.

Affected products

• Mozilla Thunderbird: from 68.0, before 102.7.1 (fixed in 102.7.1)

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