CVE-2025-5265 Potential local code execution in “Copy as cURL” command

What is CVE-2025-5265?

CVE-2025-5265 is a medium-severity command injection vulnerability in Mozilla Firefox, published on 27 May 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

Due to insufficient escaping of the ampersand 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 bug only affects Firefox for Windows. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox 139, Firefox ESR 115.24, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

Weakness: CWE-77

Which versions are affected by CVE-2025-5265?

It affects 1 product.

Products include Mozilla Firefox.

How do I fix CVE-2025-5265?

Upgrade to a fixed version.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2025-5265 being exploited?

There is no known exploitation of CVE-2025-5265 in the wild and no public exploit code.

Other vulnerabilities in Mozilla Firefox

• CVE-2019-11708 Mozilla Firefox and Thunderbird Sandbox Escape Exploited Critical 10.0
• CVE-2010-3765 Mozilla Multiple Products Remote Code Execution Exploited Critical 9.8
• CVE-2022-26486 Mozilla Firefox Use-After-Free Exploited Critical 9.6
• CVE-2022-26485 Mozilla Firefox Use-After-Free Exploited High 8.8
• CVE-2019-11707 Mozilla Firefox and Thunderbird Type Confusion Exploited High 8.8

All Mozilla Firefox vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-fjj5-r59g-88g7, UBUNTU-CVE-2025-5265.