CVE-2018-12373

thunderbird: S/MIME plaintext can be leaked through HTML reply/forward

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Severity

Important

Red Hat Product Security

6.5

CVSS 3.0

Review impact separately from score.

Published · May 27, 2018

Updated · January 9, 2026

Description

dDecrypted S/MIME parts hidden with CSS or the plaintext HTML tag can leak plaintext when included in a HTML reply/forward. This vulnerability affects Thunderbird < 52.9.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 6.5
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CWE-212 · Improper Removal of Sensitive Information Before Storage or Transfer