CVE-2025-4089: firefox Command Injection — Fix

Description

Due to insufficient escaping of 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 vulnerability was fixed in Firefox 138 and Thunderbird 138.

Is your site exposed to CVE-2025-4089?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

5.1

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Weakness Type (CWE)

CWE-77 CWE-77

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 138.0
mozilla	thunderbird	< 138.0

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2025-28/ https://www.mozilla.org/security/advisories/mfsa2025-31/

Other References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1949994%2C1956698%2C1960198

Frequently Asked Questions

What is CVE-2025-4089? +

Due to insufficient escaping of 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 vulnerability was fixed in Firefox 138 and Thunderbird 138. It has a CVSS v3.1 base score of 5.1 (MEDIUM).

How severe is CVE-2025-4089? +

CVE-2025-4089 has a CVSS v3.1 score of 5.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-4089? +

CVE-2025-4089 affects products from mozilla, specifically: firefox, thunderbird. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-4089? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-42258

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, symbol arguments …

CVE-2024-52011

launch-editor allows users to open files with line numbers in editor from Node.js. Prior to version 2.9.0, due to the …

CVE-2023-5878

Honeywell OneWireless Wireless Device Manager (WDM) for the following versions R310.x, R320.x, R321.x, R322.1, R322.2, R323.x, R330.1 contains a command …

CVE-2025-46735

Terraform WinDNS Provider allows users to manage their Windows DNS server resources through Terraform. A security issue has been found …

CVE-2025-4009

The Evertz SDVN 3080ipx-10G is a High Bandwidth Ethernet Switching Fabric for Video Application. This device exposes a web management …

CVE-2024-4999

A vulnerability in the web-based management interface of multiple Ligowave devices could allow an authenticated remote attacker to execute arbitrary …

CVE-2025-4089