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CVE-2025-6426: Executable File Warning Vulnerability in Firefox for macOS

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Overview

CVE-2025-6426 is a critical security vulnerability identified in Firefox for macOS. It is found that the executable file warning system does not provide appropriate alerts to users before opening files with the ‘terminal’ extension. This issue leaves the system exposed to potential threats, leading to possible system compromise or data leakage. Given that this vulnerability is present in Firefox versions below 140 and Firefox ESR versions less than 128.12, users of these versions are at significant risk.

Vulnerability Summary

CVE ID: CVE-2025-6426
Severity: High (8.8 CVSS Score)
Attack Vector: Local
Privileges Required: None
User Interaction: Required
Impact: System compromise, Data leakage

Affected Products

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Product | Affected Versions

Firefox for macOS | < 140 Firefox ESR for macOS | < 128.12 How the Exploit Works

The vulnerability exploits the lack of a warning system in Firefox that should alert users when opening files with the ‘terminal’ extension. An attacker can craft a malicious ‘terminal’ file and trick a user into opening it. Once the file is opened, the attacker can execute arbitrary code, gain unauthorized access to the system, or extract sensitive information, leading to a system compromise or data leakage.

Conceptual Example Code

Below is a conceptual example of a terminal command that could exploit the vulnerability:

# A malicious terminal command that uses the vulnerability
open -a Firefox malicious_file.terminal

This command opens the `malicious_file.terminal` using Firefox. If the user is running a vulnerable version of Firefox, the malicious file will be opened without any warning, potentially leading to the execution of harmful code.

Mitigation Measures

While the ultimate solution to this vulnerability is to apply the appropriate vendor patch, users can also employ WAF (Web Application Firewall) or IDS (Intrusion Detection System) as temporary mitigation measures until the patch is applied. Users are strongly advised to update their Firefox to the latest version to avoid potential exploitation of this vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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