What’s Vulnerable › Vulnerabilities

CVE-2023-50761

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-12-19 · updated 2026-06-17

Description

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 Linux: 11.0, 12.0
• Mozilla Thunderbird: before 115.6 — fixed in 115.6

How to fix

Upgrade to a fixed version: Mozilla Thunderbird 115.6. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1865647
• https://lists.debian.org/debian-lts-announce/2023/12/msg00021.html
• https://www.debian.org/security/2023/dsa-5582
• https://www.mozilla.org/security/advisories/mfsa2023-55/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1865647
• https://lists.debian.org/debian-lts-announce/2023/12/msg00021.html
• https://www.debian.org/security/2023/dsa-5582
• https://www.mozilla.org/security/advisories/mfsa2023-55/

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