CVE-2025-5264: Mozilla Firefox

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Due to insufficient escaping of the newline character 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 vulnerability was fixed in Firefox 139, Firefox ESR 115.24, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

Affected products

• Mozilla Firefox: before 115.24.0 (fixed in 115.24.0); before 139.0 (fixed in 139.0); from 116.0, before 128.11.0 (fixed in 128.11.0)

Published 2025-05-27. Last modified 2026-10-05.