CVE-2025-4084: Mozilla Firefox

Medium severity, CVSS 5.7. EPSS: 0.4% chance of exploitation in the next 30 days.

Due to insufficient escaping of the special characters in the "copy as cURL" feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system. *This bug only affects Firefox for Windows. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox ESR 128.10, Firefox ESR 115.23, and Thunderbird 128.10.

Affected products

• Mozilla Firefox: before 115.23 (fixed in 115.23); from 128.0, before 128.10 (fixed in 128.10)
• Mozilla Thunderbird: before 128.10.0 (fixed in 128.10.0)

Published 2025-04-29. Last modified 2026-10-05.