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Fencer Intel
medium 6.5

CVE-2018-5185 json

Plaintext of decrypted emails can leak through by user submitting an embedded form.

published 8y ago modified 4mo ago also EUVD-2018-16970

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known

Summary

Plaintext of decrypted emails can leak through by user submitting an embedded form. This vulnerability affects Thunderbird ESR < 52.8 and Thunderbird < 52.8.

Patch / fix

  • Mozilla Thunderbird ESR 52.8
  • Mozilla Thunderbird 52.8
  • thunderbird Debian 14, Debian 13, Debian 12 1:52.8.0-1

debian advisories DEBIAN-CVE-2018-5185

  • thunderbird Ubuntu 14.04 LTS 1:52.8.0+build1-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:52.8.0+build1-0ubuntu0.16.04.1
  • thunderbird Ubuntu 18.04 LTS 1:52.8.0+build1-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2018-5185

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • thunderbird RHEL 6 52.8.0-2.el6_9
  • thunderbird RHEL 7 52.8.0-1.el7_5

red hat advisories RHSA-2018:1726RHSA-2018:1725

  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1

opensuse advisories openSUSE-SU-2024:10601-1

  • thunderbird Arch Linux 52.8.0-1

arch linux advisories AVG-707

Is CVE-2018-5185 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-5185 updated cvss 6.5

Mozilla: Leaking plaintext through HTML forms

  • Red Hat Enterprise Linux Client (v. 7) thunderbird 52.8.0-1.el7_5
    fixed: vendor fix RHSA-2018:1725
  • Red Hat Enterprise Linux Desktop (v. 6) thunderbird 52.8.0-2.el6_9
    fixed: vendor fix RHSA-2018:1726
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird 52.8.0-1.el7_5
    fixed: vendor fix RHSA-2018:1725
  • Red Hat Enterprise Linux Server Optional (v. 6) thunderbird 52.8.0-2.el6_9
    fixed: vendor fix RHSA-2018:1726
  • Red Hat Enterprise Linux Server Optional (v. 7) thunderbird 52.8.0-1.el7_5
    fixed: vendor fix RHSA-2018:1725
  • Red Hat Enterprise Linux Workstation (v. 6) thunderbird 52.8.0-2.el6_9
    fixed: vendor fix RHSA-2018:1726
  • Red Hat Enterprise Linux Workstation (v. 7) thunderbird 52.8.0-1.el7_5
    fixed: vendor fix RHSA-2018:1725
  • Red Hat Enterprise Linux 8 thunderbird
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.51% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • Mozilla Thunderbird ESR
  • Mozilla Thunderbird

Classification

Weakness
  • CWE-311 Missing Encryption of Sensitive Data

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.