HTML Attribute Injection Vulnerability in Symfony UX Libraries

CVE-2025-47946

What is CVE-2025-47946?

CVE-2025-47946 is a vulnerability found in Symfony’s UX libraries, which facilitate the integration of JavaScript tools into web applications. The vulnerability arises from the improper handling of HTML attributes when rendering component attributes. In versions prior to 2.25.1, the framework outputs attribute values directly without escaping them. This flaw is particularly serious because if these values are derived from user input, it can lead to HTML attribute injection and vulnerabilities like cross-site scripting (XSS). Such vulnerabilities can allow malicious users to execute scripts in the context of a user's browser session, potentially leading to data theft, session hijacking, or other malicious activities. Organizations leveraging Symfony UX libraries for their web applications could face significant security risks if they do not address this vulnerability appropriately.

Potential impact of CVE-2025-47946

1. Cross-Site Scripting (XSS) Attacks: The primary impact of CVE-2025-47946 is the potential for XSS attacks, where an attacker can inject malicious scripts into web pages viewed by other users. This can compromise user sessions and lead to unauthorized access to sensitive information.

2. Data Integrity Risks: Exploitation of this vulnerability may allow attackers to manipulate or alter the data displayed in web applications, impacting data integrity and causing misinformation or unauthorized changes to application states.

3. Loss of User Trust: As organizations face data breaches or manipulated content due to this vulnerability, there could be a significant loss of trust from users and clients, resulting in reputational damage and financial consequences.

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