CVE-2023-50761: Debian Linux

Medium severity, CVSS 4.3. EPSS: 0.6% chance of exploitation in the next 30 days.

The signature of a digitally signed S/MIME email message may optionally specify the signature creation date and time. If present, Thunderbird did not compare the signature creation date with the message date and time, and displayed a valid signature despite a date or time mismatch. This could be used to give recipients the impression that a message was sent at a different date or time. This vulnerability affects Thunderbird < 115.6.

Affected products

• Debian Debian Linux: version 11.0 only; version 12.0 only
• Mozilla Thunderbird: before 115.6 (fixed in 115.6)

Published 2023-12-19. Last modified 2026-06-17.