What’s Vulnerable › Vulnerabilities

CVE-2019-11739

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-09-27 · updated 2026-06-17
• Weakness: CWE-319

Description

Encrypted S/MIME parts in a crafted multipart/alternative message can leak plaintext when included in a a HTML reply/forward. This vulnerability affects Thunderbird < 68.1 and Thunderbird < 60.9.

Affected products

• Mozilla Thunderbird: before 60.9.0; from 68.0 before 68.1.0 — fixed in 60.9.0, 68.1.0

How to fix

Upgrade to a fixed version: Mozilla Thunderbird 60.9.0, 68.1.0. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
• https://bugzilla.mozilla.org/show_bug.cgi?id=1571481
• https://usn.ubuntu.com/4150-1/
• https://www.mozilla.org/security/advisories/mfsa2019-29/
• https://www.mozilla.org/security/advisories/mfsa2019-30/
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
• https://bugzilla.mozilla.org/show_bug.cgi?id=1571481
• https://usn.ubuntu.com/4150-1/
• https://www.mozilla.org/security/advisories/mfsa2019-29/
• https://www.mozilla.org/security/advisories/mfsa2019-30/

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