What’s Vulnerable › Vulnerabilities

CVE-2023-4052

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-08-01 · updated 2026-10-23
• Weakness: CWE-59

Description

The Firefox updater created a directory writable by non-privileged users. When uninstalling Firefox, any files in that directory would be recursively deleted with the permissions of the uninstalling user account. This could be combined with creation of a junction (a form of symbolic link) to allow arbitrary file deletion controlled by the non-privileged user. *This bug only affects Firefox on Windows. Other operating systems are unaffected.* This vulnerability affects Firefox < 116, Firefox ESR < 115.1, and Thunderbird < 115.1.

Affected products

• Mozilla Firefox: before 116.0 — fixed in 116.0
• Mozilla Firefox ESR: before 115.1 — fixed in 115.1

How to fix

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

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1824420
• https://www.mozilla.org/security/advisories/mfsa2023-29/
• https://www.mozilla.org/security/advisories/mfsa2023-31/
• https://www.mozilla.org/security/advisories/mfsa2023-33/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1824420
• https://www.mozilla.org/security/advisories/mfsa2023-29/
• https://www.mozilla.org/security/advisories/mfsa2023-31/
• https://www.mozilla.org/security/advisories/mfsa2023-33/

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