CVE-2024-51916 is a DOM-based Cross-site Scripting (XSS) vulnerability identified in the Creative Brahma Multifox Plus browser extension, specifically affecting versions up to 1.1.6. The vulnerability stems from improper neutralization of user input during the generation of web page content within the extension, allowing attackers to inject and execute arbitrary JavaScript code in the context of the victim's browser session. This form of XSS is client-side and occurs when the extension processes untrusted input without adequate sanitization or encoding, leading to script execution in the Document Object Model (DOM). An attacker can exploit this by tricking users into visiting maliciously crafted URLs or web pages that leverage the vulnerable input handling. The Multifox Plus extension is designed to manage multiple browser profiles, and the vulnerability could allow attackers to hijack user sessions, steal sensitive information such as cookies or credentials, or perform unauthorized actions on behalf of the user within the browser context. No authentication is required for exploitation, but user interaction is necessary to trigger the malicious payload. Currently, there are no known exploits in the wild, and no official patches have been linked yet. The vulnerability was published on November 19, 2024, and is tracked under CVE-2024-51916. Due to the lack of a CVSS score, severity assessment is based on the potential impact and ease of exploitation. The vulnerability affects the confidentiality and integrity of user data and browser sessions, with a medium to high scope depending on the user base of the extension.

The impact of CVE-2024-51916 is significant for users of the Multifox Plus extension, as exploitation can lead to unauthorized script execution within the browser context. This can result in session hijacking, theft of sensitive information such as cookies, credentials, or personal data, and unauthorized actions performed on behalf of the user. For organizations, especially those with employees using this extension, the vulnerability could lead to compromised accounts, data breaches, and lateral movement within internal networks if browser sessions are leveraged. The attack requires user interaction but no authentication, increasing the risk of widespread exploitation through phishing or malicious websites. Although Multifox Plus is a niche extension, its users may include privacy-conscious individuals and professionals managing multiple profiles, making the impact on confidentiality and integrity critical. The availability of the browser or extension is unlikely to be affected directly, but the trustworthiness of user sessions and data integrity is at risk. Organizations relying on browser extensions for profile management should consider the risk of such vulnerabilities as part of their broader security posture.

1. Immediately disable the Multifox Plus extension in browsers until a security patch is released by Creative Brahma. 2. Monitor official vendor channels and security advisories for updates or patches addressing CVE-2024-51916 and apply them promptly once available. 3. Educate users about the risks of clicking on untrusted links or visiting suspicious websites, emphasizing the potential for XSS attacks via browser extensions. 4. Implement browser security policies that restrict or monitor the use of third-party extensions, especially those that handle sensitive data or multiple profiles. 5. Use Content Security Policy (CSP) headers where possible to limit the execution of unauthorized scripts within web applications accessed by users. 6. Employ endpoint detection and response (EDR) tools to monitor for unusual browser behaviors that may indicate exploitation attempts. 7. Consider alternative, more secure methods for managing multiple browser profiles that do not rely on vulnerable extensions. 8. Conduct regular security awareness training focused on social engineering and phishing tactics that could trigger such vulnerabilities.