CVE-2025-30190 is a cross-site scripting vulnerability identified in Open-Xchange GmbH's OX App Suite, a widely used collaborative office and communication platform. The vulnerability stems from improper neutralization of input during web page generation, specifically when users edit office documents within the suite. Maliciously crafted office documents can embed script code that executes in the context of the user's session when the document is opened or edited. This allows attackers to perform actions such as exfiltrating sensitive information, manipulating user data, or triggering unintended operations without requiring authentication but necessitating user interaction (opening/editing the document). The CVSS v3.1 base score is 5.4, indicating medium severity, with an attack vector over the network, low attack complexity, no privileges required, but user interaction needed. The vulnerability affects all versions of OX App Suite prior to the patch release. Although no public exploits are currently available, the risk remains significant due to the potential for targeted phishing or social engineering attacks leveraging malicious documents. The vulnerability highlights the importance of robust input validation and output encoding in web applications that process user-generated content, especially in collaborative environments.

For European organizations, this vulnerability poses a risk of data leakage and unauthorized actions within OX App Suite environments. Given the platform's use in email, calendaring, and document collaboration, exploitation could lead to exposure of confidential business information, intellectual property, or personal data protected under GDPR. The attack could facilitate lateral movement or privilege escalation if combined with other vulnerabilities or misconfigurations. Disruption of business workflows and loss of user trust are additional concerns. Organizations in sectors such as finance, government, and healthcare, which often use OX App Suite or similar platforms, may face regulatory and reputational consequences if exploited. The medium severity indicates moderate impact but ease of exploitation via social engineering increases the threat level. The absence of public exploits reduces immediate widespread risk but does not eliminate targeted attack possibilities.

Organizations should promptly apply the security patches released by Open-Xchange GmbH to remediate this vulnerability. In addition, implement strict content security policies (CSP) to limit script execution contexts within the OX App Suite environment. Employ email and document filtering solutions to detect and block malicious attachments or embedded scripts. Train users to recognize and avoid opening suspicious or unexpected office documents, especially from untrusted sources. Monitor logs for unusual activity related to document editing or script execution within the platform. Consider deploying web application firewalls (WAF) with rules tailored to detect XSS payloads targeting OX App Suite. Regularly review and update security configurations and conduct penetration testing focused on input validation and script injection vectors. Finally, maintain an incident response plan to quickly address any exploitation attempts.