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Fencer Vulns
medium 6.5

CVE-2023-5727 json

The executable file warning was not presented when downloading .msix, .msixbundle, .appx, and .appxbundle files, which can run commands on…

published 2023-10-24 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-58013

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

The executable file warning was not presented when downloading .msix, .msixbundle, .appx, and .appxbundle files, which can run commands on a user's computer. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.* This vulnerability affects Firefox < 119, Firefox ESR < 115.4, and Thunderbird < 115.4.1.

Patch / fix

  • Mozilla Firefox 119
  • Mozilla Firefox ESR 115.4
  • Mozilla Thunderbird 115.4.1
  • thunderbird Ubuntu 20.04 LTS 1:115.4.1+build1-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:115.4.1+build1-0ubuntu0.22.04.1
  • thunderbird Ubuntu 24.04 LTS 1:115.4.1+build1-0ubuntu1

ubuntu advisories UBUNTU-CVE-2023-5727

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

  • MozillaFirefox SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +9 more 115.5.0-150200.152.117.1
  • MozillaFirefox SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 115.5.0-112.191.1
  • MozillaThunderbird SLE Workstation Extension 15 SP5, SLE Workstation Extension 15 SP4, SLE Module for Package Hub 15 SP5 +3 more 115.4.1-150200.8.136.1
  • MozillaFirefox SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +9 more 115.4.0-150200.152.114.1
  • MozillaFirefox SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 115.4.0-112.188.1
  • MozillaFirefox SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 115.5.0-150000.150.116.1
  • MozillaFirefox SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 115.4.0-150000.150.113.1

suse advisories SUSE-SU-2023:4551-1SUSE-SU-2023:4533-1SUSE-SU-2023:4532-1SUSE-SU-2023:4302-1SUSE-SU-2023:4214-1SUSE-SU-2023:4213-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaThunderbird openSUSE Tumbleweed 115.4.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 119.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:13356-1openSUSE-SU-2024:13385-1

  • firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +3 more 119.0-r0
  • librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 119.0-r0
  • firefox-esr Alpine 3.18 115.5.0-r0
  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +2 more 115.4.0-r0
  • thunderbird Alpine 3.18 115.4.0-r0
  • thunderbird Alpine 3.23, Alpine 3.22, Alpine 3.21 +2 more 115.4.1-r0

alpine advisories ALPINE-CVE-2023-5727

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2023-5727 updated cvss 6.1

Mozilla: Download Protections were bypassed by .msix, .msixbundle, .appx, and .appxbundle files on Windows

  • Red Hat Enterprise Linux 6 firefox, thunderbird Red Hat Enterprise Linux 7 firefox, thunderbird Red Hat Enterprise Linux 8 firefox, thunderbird Red Hat Enterprise Linux 9 firefox, firefox-x11, 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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.83% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected products

  • Mozilla Firefox
  • Mozilla Firefox ESR
  • 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.