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CVE-2025-49399: Critical CSRF Vulnerability in Basix NEX-Forms

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Overview

CVE-2025-49399 represents a critical cybersecurity threat, a Cross-Site Request Forgery (CSRF) vulnerability, that affects Basix NEX-Forms. This vulnerability is particularly dangerous as it allows an attacker to perform actions on a website on behalf of authenticated users without their knowledge, potentially leading to system compromise or data leakage. Given the widespread use of NEX-Forms, this vulnerability has a broad impact, affecting numerous websites and users worldwide. Therefore, understanding and addressing this vulnerability is of utmost importance to protect system integrity and data confidentiality.

Vulnerability Summary

CVE ID: CVE-2025-49399
Severity: Critical (8.8 CVSS score)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Basix NEX-Forms | Up to 9.1.3

How the Exploit Works

This CSRF vulnerability is exploited when an attacker tricks a victim into executing unwanted actions on a web application in which they’re authenticated. The attack works by including a link or script in a page that accesses a site where the user is known to be authenticated. In the context of this vulnerability, an attacker can forge a request to the Basix NEX-Forms, leading to unauthorized actions.

Conceptual Example Code

Below is a conceptual example of how this vulnerability might be exploited using a malicious payload in an HTTP POST request:

POST /nex-forms/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
user_session=ValidUserSession&form_id=1&action=delete

In this example, the attacker forges a POST request to delete a form on the victim’s behalf without their knowledge or consent.

Mitigation

To mitigate this vulnerability, users are advised to apply the vendor patch once it becomes available. Until then, the use of a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can offer temporary mitigation by detecting and preventing CSRF attacks. Regular updating and patching of systems, as well as user education on the dangers of clicking on untrusted links, are crucial in maintaining a strong security posture against such attacks.

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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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