What’s Vulnerable › Vulnerabilities

CVE-2023-4054

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-08-01 · updated 2026-06-17

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.

Affected products

• Mozilla Firefox: before 116.0; from 102.0 before 102.14; from 115.0 before 115.1 — fixed in 102.14, 115.1, 116.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 102.14, 115.1, 116.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1840777
• https://www.mozilla.org/security/advisories/mfsa2023-29/
• https://www.mozilla.org/security/advisories/mfsa2023-30/
• https://www.mozilla.org/security/advisories/mfsa2023-31/
• https://www.mozilla.org/security/advisories/mfsa2023-32/
• https://www.mozilla.org/security/advisories/mfsa2023-33/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1840777
• https://www.mozilla.org/security/advisories/mfsa2023-29/
• https://www.mozilla.org/security/advisories/mfsa2023-30/
• https://www.mozilla.org/security/advisories/mfsa2023-31/
• https://www.mozilla.org/security/advisories/mfsa2023-32/
• https://www.mozilla.org/security/advisories/mfsa2023-33/

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