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Fencer Vulns
medium 4.3

CVE-2023-50761 json

The signature of a digitally signed S/MIME email message may optionally specify the signature creation date and time.

published 2023-12-19 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-55514

cvss
4.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
0
none known

Summary

The signature of a digitally signed S/MIME email message may optionally specify the signature creation date and time. If present, Thunderbird did not compare the signature creation date with the message date and time, and displayed a valid signature despite a date or time mismatch. This could be used to give recipients the impression that a message was sent at a different date or time. This vulnerability affects Thunderbird < 115.6.

Patch / fix

  • Mozilla Thunderbird 115.6
  • thunderbird Debian 12 1:115.6.0-1~deb12u1
  • thunderbird Debian 14, Debian 13 1:115.6.0-1

debian advisories DEBIAN-CVE-2023-50761

  • thunderbird Ubuntu 20.04 LTS 1:115.6.0+build2-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:115.6.0+build2-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2023-50761

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 8 115.6.0-1.el8_9
  • thunderbird RHEL 7 115.6.0-1.el7_9
  • thunderbird RHEL 9 115.6.0-1.el9_3
  • thunderbird RHEL 8.4 TUS, RHEL 8.4 E4S, RHEL 8.4 AUS 115.6.0-1.el8_4
  • thunderbird RHEL 9.2 EUS 115.6.0-1.el9_2
  • thunderbird RHEL 8.2 TUS, RHEL 8.2 E4S, RHEL 8.2 AUS 115.6.0-1.el8_2
  • thunderbird RHEL 8.8 EUS 115.6.0-1.el8_8
  • thunderbird RHEL 9.0 EUS 115.6.0-1.el9_0

red hat advisories RHSA-2024:0003RHSA-2024:0028RHSA-2024:0029RHSA-2024:0030RHSA-2024:0027RHSA-2024:0001

  • MozillaThunderbird SLE Workstation Extension 15 SP5, SLE Module for Package Hub 15 SP5, openSUSE Leap 15.5 115.6.0-150200.8.142.2

suse advisories SUSE-SU-2024:0044-1

  • MozillaThunderbird openSUSE Tumbleweed 115.6.0-1.1

opensuse advisories openSUSE-SU-2024:13519-1

  • thunderbird AlmaLinux 9 115.6.0-1.el9_3.alma
  • thunderbird AlmaLinux 8 115.6.0-1.el8_9.alma

almalinux advisories ALSA-2024:0001ALSA-2024:0003

  • thunderbird Rocky Linux 8 115.6.0-1.el8_9

rocky linux advisories RLSA-2024:0003

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-2023-50761 updated cvss 7.5

Mozilla: S/MIME signature accepted despite mismatching message date

  • Red Hat Enterprise Linux 6 thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) thunderbird 115.6.0-1.el8_9
    fixed: vendor fix RHSA-2024:0003
  • Red Hat Enterprise Linux AppStream (v. 9) thunderbird 115.6.0-1.el9_3
    fixed: vendor fix RHSA-2024:0001
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird 115.6.0-1.el8_2
    fixed: vendor fix RHSA-2024:0030
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird 115.6.0-1.el8_4
    fixed: vendor fix RHSA-2024:0028
  • Red Hat Enterprise Linux AppStream E4S (v. 8.2) thunderbird 115.6.0-1.el8_2
    fixed: vendor fix RHSA-2024:0030
  • Red Hat Enterprise Linux AppStream E4S (v.8.4) thunderbird 115.6.0-1.el8_4
    fixed: vendor fix RHSA-2024:0028
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) thunderbird 115.6.0-1.el8_6
    fixed: vendor fix RHSA-2024:0005
show 6 more
  • Red Hat Enterprise Linux AppStream EUS (v.8.8) thunderbird 115.6.0-1.el8_8
    fixed: vendor fix RHSA-2024:0004
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) thunderbird 115.6.0-1.el9_0
    fixed: vendor fix RHSA-2024:0002
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) thunderbird 115.6.0-1.el9_2
    fixed: vendor fix RHSA-2024:0029
  • Red Hat Enterprise Linux AppStream TUS (v. 8.2) thunderbird 115.6.0-1.el8_2
    fixed: vendor fix RHSA-2024:0030
  • Red Hat Enterprise Linux AppStream TUS (v.8.4) thunderbird 115.6.0-1.el8_4
    fixed: vendor fix RHSA-2024:0028
  • Red Hat Enterprise Linux Client (v. 7) thunderbird 115.6.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) thunderbird 115.6.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) thunderbird 115.6.0-1.el7_9
    fixed: vendor fix RHSA-2024:0027

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

0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Affected products

  • Mozilla Thunderbird

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.