CVE-2024-3863: Mozilla Firefox

Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days.

The executable file warning was not presented when downloading .xrm-ms files. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.* This vulnerability affects Firefox < 125, Firefox ESR < 115.10, and Thunderbird < 115.10.

Affected products

• Mozilla Firefox: before 115.10.0 (fixed in 115.10.0); before 125.0 (fixed in 125.0)
• Mozilla Thunderbird: before 115.10 (fixed in 115.10)

Published 2024-04-16. Last modified 2026-06-17.