CVE-2023-4054

Name: CVE-2023-4054
Creator: NVD / NIST
Published: 2023-08-01T16:15:09.89+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.22%

Last modified Jun 17, 2026

CVE-2023-4054 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. When opening appref-ms files, Firefox did not warn the user that these files may contain malicious code. *This bug only affects Firefox on Windows. EPSS estimates a 0.22% chance of exploitation in the next 30 days.

Description

When opening appref-ms files, Firefox did not warn the user that these files may contain malicious code. *This bug only affects Firefox on Windows. Other operating systems are unaffected.* This vulnerability affects Firefox < 116, Firefox ESR < 102.14, Firefox ESR < 115.1, Thunderbird < 102.14, and Thunderbird < 115.1.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

EPSS Probability

0.22%

12.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 116.0
Mozilla	Firefox	>= 102.0, < 102.14
Mozilla	Firefox	>= 115.0, < 115.1

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1840777Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2023-29/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-30/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-31/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-32/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-33/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1840777Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2023-29/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-30/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-31/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-32/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-33/Vendor Advisory

Timeline

Published: Aug 1, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-4054?

How severe is CVE-2023-4054?

CVE-2023-4054 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.

How do I fix CVE-2023-4054?

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-2023-4054?

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

Scan your code now

Source: NVD / NIST