CVE-2024-5692: Mozilla Firefox

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

On Windows 10, when using the 'Save As' functionality, an attacker could have tricked the browser into saving the file with a disallowed extension such as `.url` by including an invalid character in the extension. *Note:* This issue only affected Windows operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 127, Firefox ESR < 115.12, and Thunderbird < 115.12.

Affected products

• Mozilla Firefox: before 115.12 (fixed in 115.12); before 127.0 (fixed in 127.0)
• Mozilla Thunderbird: before 115.12 (fixed in 115.12)

Published 2024-06-11. Last modified 2026-06-17.