CVE-2018-12372

Name: CVE-2018-12372
Creator: NVD / NIST
Published: 2018-10-18T13:29:03.977+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.47%

Last modified Jun 17, 2026

CVE-2018-12372 is a vulnerability of currently unknown severity. Decrypted S/MIME parts, when included in HTML crafted for an attack, can leak plaintext when included in a a HTML reply/forward. This vulnerability affects Thunderbird < 52.9.. EPSS estimates a 2.47% chance of exploitation in the next 30 days.

Description

Decrypted S/MIME parts, when included in HTML crafted for an attack, can leak plaintext when included in a a HTML reply/forward. This vulnerability affects Thunderbird < 52.9.

Metrics

EPSS Probability

2.47%

82.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Mozilla	Thunderbird	< 52.9.0
Redhat	Enterprise Linux	6.0
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux	7.5
Redhat	Enterprise Linux	7.6
Redhat	Enterprise Linux Desktop	6.0
Redhat	Enterprise Linux Desktop	7.0
Redhat	Enterprise Linux Server	6.0
Redhat	Enterprise Linux Server	7.0
Redhat	Enterprise Linux Workstation	6.0
Redhat	Enterprise Linux Workstation	7.0
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	17.10
Canonical	Ubuntu Linux	18.04

References

http://www.securityfocus.com/bid/104613Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:2251Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2252Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1419417Issue Tracking, Permissions Required, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2018/07/msg00013.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/201811-13Third Party Advisory
https://usn.ubuntu.com/3714-1/Third Party Advisory
https://www.debian.org/security/2018/dsa-4244Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-18/Vendor Advisory
http://www.securityfocus.com/bid/104613Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:2251Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2252Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1419417Issue Tracking, Permissions Required, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2018/07/msg00013.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/201811-13Third Party Advisory
https://usn.ubuntu.com/3714-1/Third Party Advisory
https://www.debian.org/security/2018/dsa-4244Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-18/Vendor Advisory

Timeline

Published: Oct 18, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-12372?

Decrypted S/MIME parts, when included in HTML crafted for an attack, can leak plaintext when included in a a HTML reply/forward. This vulnerability affects Thunderbird < 52.9.

How severe is CVE-2018-12372?

Severity scoring for CVE-2018-12372 is pending analysis. The EPSS model estimates a 2.47% probability of exploitation in the next 30 days.

How do I fix CVE-2018-12372?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-12372?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST