CVE-2022-46874: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 0.9% chance of exploitation in the next 30 days.

A file with a long filename could have had its filename truncated to remove the valid extension, leaving a malicious extension in its place. This could potentially led to user confusion and the execution of malicious code.<br/>*Note*: This issue was originally included in the advisories for Thunderbird 102.6, but a patch (specific to Thunderbird) was omitted, resulting in it actually being fixed in Thunderbird 102.6.1. This vulnerability affects Firefox < 108, Thunderbird < 102.6.1, Thunderbird < 102.6, and Firefox ESR < 102.6.

Affected products

• Mozilla Firefox: before 108.0 (fixed in 108.0)
• Mozilla Firefox ESR: before 102.6 (fixed in 102.6)
• Mozilla Thunderbird: before 102.6 (fixed in 102.6)

Published 2022-12-22. Last modified 2026-06-17.