CVE-2024-52887 is a cross-site scripting (XSS) vulnerability classified under CWE-79, affecting Check Point Mobile Access versions R81.10, R81.20, and R82. This vulnerability arises from improper neutralization of user input during web page generation, specifically within the handling of SNX bookmarks by authenticated end-users. An attacker with valid authentication can craft a malicious SNX bookmark containing embedded script code. When the user accesses their own bookmark list, the browser executes this script, potentially leading to client-side code execution within the context of the vulnerable web application. The vulnerability requires the attacker to be authenticated and involves user interaction (the user accessing their bookmark list). The CVSS v3.1 base score is 3.5, indicating a low severity level, with the vector AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N. This means the attack can be performed remotely over the network with low attack complexity, requires low privileges (authenticated user), and user interaction is necessary. The impact is limited to integrity, with no confidentiality or availability impact reported. There are no known exploits in the wild at the time of publication, and no patches have been linked yet. The vulnerability is specific to the web interface of Check Point Mobile Access, a VPN and remote access solution widely used in enterprise environments for secure remote connectivity.

For European organizations, the impact of this vulnerability is primarily on the integrity of user sessions and data within the Check Point Mobile Access portal. Since the vulnerability allows execution of arbitrary scripts in the context of the user's browser session, it could be leveraged for session manipulation, phishing, or injecting malicious content that could lead to further social engineering attacks. However, the requirement for authentication and user interaction limits the scope of exploitation. The vulnerability does not directly compromise confidentiality or availability, so the risk of data exfiltration or service disruption is low. Nonetheless, organizations relying heavily on Check Point Mobile Access for remote workforce connectivity could face targeted attacks aiming to escalate privileges or pivot into internal networks if combined with other vulnerabilities or social engineering. The lack of known exploits reduces immediate risk, but the presence of this vulnerability in critical remote access infrastructure warrants timely attention to avoid potential exploitation as threat actors develop attack techniques.

1. Implement strict input validation and output encoding on the SNX bookmark fields to neutralize any embedded scripts before rendering in the web interface. 2. Apply Content Security Policy (CSP) headers to restrict the execution of inline scripts and limit the sources of executable scripts within the Check Point Mobile Access web portal. 3. Enforce multi-factor authentication (MFA) to reduce the risk of unauthorized authenticated access, which is a prerequisite for exploitation. 4. Educate users about the risks of interacting with suspicious bookmarks or links within the VPN portal and encourage reporting of unusual behavior. 5. Monitor logs for unusual bookmark creation or modification activities that could indicate attempts to exploit this vulnerability. 6. Coordinate with Check Point to obtain and deploy patches or updates as soon as they become available. 7. Consider isolating the management and user access interfaces to reduce the attack surface and limit the impact of potential XSS exploitation.