CVE-2023-41710 is a stored cross-site scripting vulnerability identified in the OX App Suite product by Open-Xchange GmbH. The vulnerability stems from improper neutralization of user-supplied script code embedded within a shop upsell URL. Specifically, when this user-defined script code is added to the Document Object Model (DOM), it is not correctly sanitized, allowing malicious scripts to persist in user accounts. An attacker with at least low privileges can inject malicious JavaScript code into the upsell shop URL field. When a victim accesses the compromised user account, the malicious script executes within the security context of the trusted domain, potentially enabling actions such as session hijacking, cookie theft, or unauthorized operations within the application. The vulnerability requires user interaction, as the victim must access the affected account. The CVSS 3.1 base score is 5.4 (medium severity), reflecting network attack vector, low attack complexity, low privileges required, and user interaction needed, with partial confidentiality and integrity impacts but no availability impact. No public exploits are known at this time. The vendor has mitigated the issue by implementing proper sanitization of the user-supplied content before insertion into the DOM, preventing script execution. Organizations using OX App Suite should verify they have applied the latest updates and review their input validation and output encoding practices to prevent similar issues.

For European organizations using OX App Suite, this vulnerability poses a moderate risk primarily to confidentiality and integrity. Exploitation could allow attackers to execute arbitrary scripts in the context of the trusted domain, potentially leading to session hijacking, unauthorized actions, or data leakage within the application. This could compromise sensitive user data or internal communications managed through the suite. While availability is not impacted, the breach of confidentiality and integrity could disrupt business operations and damage trust. Given that OX App Suite is widely used by European enterprises and service providers for email and collaboration, the vulnerability could affect a broad user base. Attackers might leverage this flaw to target high-value accounts or pivot within networks. The requirement for user interaction and low privileges reduces the likelihood of mass exploitation but does not eliminate targeted attacks. Organizations handling sensitive communications or regulated data should consider this a significant concern and act promptly to remediate.

Organizations should immediately ensure that their OX App Suite installations are updated with the vendor's latest patches that implement proper sanitization of user-supplied content. Beyond patching, administrators should audit and restrict the ability of users to input scriptable content, especially in fields related to URLs or HTML content. Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts within the application domain. Conduct regular security reviews of user input handling and output encoding mechanisms to detect and remediate similar injection flaws. Educate users about phishing and social engineering tactics that could lead to exploitation of stored XSS vulnerabilities. Monitor logs and user activity for suspicious behavior indicative of XSS exploitation attempts. If feasible, isolate or sandbox components that handle user-generated content to limit the impact of potential script execution. Finally, coordinate with the vendor for ongoing updates and advisories related to OX App Suite security.