Encrypted S/MIME parts in a crafted multipart/alternative message can leak plaintext when included in a a HTML reply/forward. This…

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.

Scores

EPSS (exploitation in 30 days)

0.91% · top 40% of all CVEs (7 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Weakness

• Covert Content Attack on S/MIME encryption using a crafted multipart/alternative message
• CWE-319 (opens in a new tab)All about CWE-319 and its CVEs

Affected products

• Mozilla · Thunderbird

  • affected unspecified – < 68.1
  • affected unspecified – < 60.9

References (6)

• https://bugzilla.mozilla.org/show_bug.cgi?id=1571481 (opens in a new tab)x_refsource_MISCx_transferred
• https://www.mozilla.org/security/advisories/mfsa2019-29/ (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://www.mozilla.org/security/advisories/mfsa2019-30/ (opens in a new tab)x_refsource_CONFIRMx_transferred
• openSUSE-SU-2019:2248 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
• openSUSE-SU-2019:2249 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
• USN-4150-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2019-11739](https://trackcve.app/badge/CVE-2019-11739.svg)](https://trackcve.app/cve/CVE-2019-11739)

Record last updated 4 Aug 2024, 23:03 UTC.