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Fencer Vulns
high 7.5

CVE-2024-1936 json

The encrypted subject of an email message could be incorrectly and permanently assigned to an arbitrary other email message in Thunderbird'…

published 2024-03-04 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-17658

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

The encrypted subject of an email message could be incorrectly and permanently assigned to an arbitrary other email message in Thunderbird's local cache. Consequently, when replying to the contaminated email message, the user might accidentally leak the confidential subject to a third-party. While this update fixes the bug and avoids future message contamination, it does not automatically repair existing contaminations. Users are advised to use the repair folder functionality, which is available from the context menu of email folders, which will erase incorrect subject assignments. This vulnerability affects Thunderbird < 115.8.1.

Patch / fix

  • Mozilla Thunderbird 115.8.1
  • thunderbird Debian 12 1:115.9.0-1~deb12u1
  • thunderbird Debian 14, Debian 13 1:115.8.1-1

debian advisories DEBIAN-CVE-2024-1936

  • thunderbird Ubuntu 20.04 LTS 1:115.8.1+build1-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:115.8.1+build1-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2024-1936

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 7 115.9.0-1.el7_9
  • thunderbird RHEL 9 115.9.0-1.el9_3
  • thunderbird RHEL 8 115.9.0-1.el8_9
  • thunderbird RHEL 8.4 TUS, RHEL 8.4 E4S, RHEL 8.4 AUS 115.9.0-1.el8_4
  • thunderbird RHEL 8.2 TUS, RHEL 8.2 E4S, RHEL 8.2 AUS 115.9.0-1.el8_2
  • thunderbird RHEL 8.8 EUS 115.9.0-1.el8_8
  • thunderbird RHEL 8.6 EUS 115.9.0-1.el8_6
  • thunderbird RHEL 9.2 EUS 115.9.0-1.el9_2

red hat advisories RHSA-2024:1499RHSA-2024:1500RHSA-2024:1496RHSA-2024:1497RHSA-2024:1498RHSA-2024:1492

  • MozillaThunderbird SLE Workstation Extension 15 SP5, SLE Module for Package Hub 15 SP5, openSUSE Leap 15.5 115.8.1-150200.8.151.1

suse advisories SUSE-SU-2024:0893-1

  • MozillaThunderbird openSUSE Tumbleweed 115.8.1-1.1

opensuse advisories openSUSE-SU-2024:13753-1

  • thunderbird AlmaLinux 9 115.9.0-1.el9_3.alma.1
  • thunderbird AlmaLinux 8 115.9.0-1.el8_9.alma.1

almalinux advisories ALSA-2024:1493ALSA-2024:1494

  • thunderbird Rocky Linux 8 115.9.0-1.el8_9

rocky linux advisories RLSA-2024:1494

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-2024-1936 updated cvss 7.5

Mozilla: Leaking of encrypted email subjects to other conversations

  • Red Hat Enterprise Linux 6 thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) thunderbird 115.9.0-1.el8_9
    fixed: vendor fix RHSA-2024:1494
  • Red Hat Enterprise Linux AppStream (v. 9) thunderbird 115.9.0-1.el9_3
    fixed: vendor fix RHSA-2024:1493
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird 115.9.0-1.el8_2
    fixed: vendor fix RHSA-2024:1500
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird 115.9.0-1.el8_4
    fixed: vendor fix RHSA-2024:1499
  • Red Hat Enterprise Linux AppStream E4S (v. 8.2) thunderbird 115.9.0-1.el8_2
    fixed: vendor fix RHSA-2024:1500
  • Red Hat Enterprise Linux AppStream E4S (v.8.4) thunderbird 115.9.0-1.el8_4
    fixed: vendor fix RHSA-2024:1499
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) thunderbird 115.9.0-1.el8_6
    fixed: vendor fix RHSA-2024:1497
show 6 more
  • Red Hat Enterprise Linux AppStream EUS (v.8.8) thunderbird 115.9.0-1.el8_8
    fixed: vendor fix RHSA-2024:1496
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) thunderbird 115.9.0-1.el9_0
    fixed: vendor fix RHSA-2024:1495
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) thunderbird 115.9.0-1.el9_2
    fixed: vendor fix RHSA-2024:1492
  • Red Hat Enterprise Linux AppStream TUS (v. 8.2) thunderbird 115.9.0-1.el8_2
    fixed: vendor fix RHSA-2024:1500
  • Red Hat Enterprise Linux AppStream TUS (v.8.4) thunderbird 115.9.0-1.el8_4
    fixed: vendor fix RHSA-2024:1499
  • Red Hat Enterprise Linux Client (v. 7) thunderbird 115.9.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) thunderbird 115.9.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) thunderbird 115.9.0-1.el7_9
    fixed: vendor fix RHSA-2024:1498

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

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1860977 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Mozilla Thunderbird

Classification

Weakness
  • CWE-922 Insecure Storage of Sensitive Information

References

Sources

Fencer Vulns 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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.