Code Injection in Mozilla Firefox and Firefox ESR - CVE-2025-11713
Published: October 14, 2025 / Updated: April 21, 2026
Vulnerability identifier: #VU116997
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2025-11713
CWE-ID: CWE-94
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Mozilla Firefox
Firefox ESR
Mozilla Firefox
Firefox ESR
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation in the “Copy as cURL” feature. A remote attacker can send trick the victim into copying a specially crafted URL and execute arbitrary code on the system.
Note, the vulnerability affects Windows installations only.
How to mitigate CVE-2025-11713
Install updates from vendor's website.