CVE-2025-53858 in ChatLuck
Summary
by MITRE • 10/16/2025
ChatLuck contains a cross-site scripting vulnerability in Chat Rooms. If exploited, an arbitrary script may be executed on the web browser of the user who is accessing the product.
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Analysis
by VulDB Data Team • 10/16/2025
CVE-2025-53858 represents a cross-site scripting vulnerability within the ChatLuck chat room functionality that poses significant security risks to end users. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is one of the most prevalent and dangerous web application security flaws. The vulnerability exists in the chat room component where user input is not properly sanitized or validated before being rendered back to other users within the same chat environment. When an attacker crafts malicious input containing script code and injects it into the chat room, this code gets executed in the browsers of other users who view the malicious content.
The operational impact of this vulnerability extends beyond simple script execution as it can enable attackers to perform various malicious activities including session hijacking, credential theft, and data exfiltration. Attackers can exploit this weakness by embedding malicious scripts within chat messages that target other users in the room. These scripts can steal session cookies, redirect users to malicious websites, or even inject additional malicious content into the chat interface. The vulnerability is particularly dangerous in chat environments where multiple users interact in real-time, as a single malicious message can compromise numerous users simultaneously.
From an attack perspective, this vulnerability aligns with several ATT&CK techniques including T1566 for social engineering through malicious content and T1059 for command and script injection. The exploitation requires minimal technical skill as attackers can leverage existing web application penetration testing tools to craft payloads that bypass basic input validation mechanisms. The vulnerability demonstrates poor input sanitization practices where user-provided content is directly rendered without proper encoding or validation, creating an environment where attacker-controlled scripts can execute with the privileges of the victim user's browser session.
Organizations should implement comprehensive mitigations including strict input validation and output encoding for all user-provided content within chat interfaces. The implementation of Content Security Policy headers, proper HTML escaping, and sanitization of user inputs can effectively prevent XSS exploitation. Additionally, the system should employ real-time monitoring of chat room activities to detect and block suspicious content patterns. Regular security testing including dynamic application security testing and manual penetration testing should be conducted to identify similar vulnerabilities in other components of the application. The vulnerability underscores the critical importance of secure coding practices and proper input validation in web applications, particularly in interactive environments where user-generated content is prevalent and continuously processed.