CVE-2025-10558 is a stored Cross-site Scripting (XSS) vulnerability classified under CWE-79 affecting the 3DSearch feature within Dassault Systèmes' 3DSwymer product, specifically on the Release 3DEXPERIENCE R2025x Golden version. Stored XSS occurs when malicious input is persistently stored by the application and later rendered in web pages without proper sanitization or encoding, allowing attackers to execute arbitrary JavaScript in the browsers of users who view the affected content. This vulnerability enables an attacker with low privileges (PR:L) to inject malicious scripts that execute when other users interact with the compromised web page, requiring user interaction (UI:R). The vulnerability has a CVSS v3.1 base score of 8.7, indicating high severity, with attack vector being network (AV:N), low attack complexity (AC:L), and scope changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact on confidentiality and integrity is high (C:H/I:H), while availability is not affected (A:N). Exploitation could lead to session hijacking, theft of sensitive information, or unauthorized actions performed on behalf of the victim user. Although no known exploits are currently reported in the wild, the presence of this vulnerability in a widely used engineering collaboration platform poses a significant risk. The lack of available patches at the time of publication necessitates immediate attention to mitigation strategies and monitoring. The vulnerability stems from improper neutralization of input during web page generation, highlighting a failure in input validation and output encoding mechanisms within the 3DSearch component.

For European organizations, especially those in aerospace, automotive, and manufacturing sectors that rely heavily on Dassault Systèmes' 3DEXPERIENCE platform and its 3DSwymer module, this vulnerability could lead to severe data breaches and operational disruptions. Attackers exploiting this stored XSS could hijack user sessions, steal intellectual property, or manipulate design data, undermining confidentiality and integrity of sensitive engineering information. Given the collaborative nature of 3DSwymer, compromised user accounts could be leveraged to spread malware or conduct further attacks within the organization's network. The high severity and network-based attack vector increase the likelihood of remote exploitation, potentially affecting multiple users across an organization. The absence of known exploits currently provides a window for proactive defense, but the criticality of the affected sectors in Europe amplifies the potential impact. Additionally, regulatory implications under GDPR may arise if personal or sensitive data is exposed due to exploitation of this vulnerability.

Organizations should prioritize the following specific mitigation steps: 1) Monitor Dassault Systèmes' official channels for patches addressing CVE-2025-10558 and apply them immediately upon release. 2) Implement strict input validation and output encoding on all user-supplied data within the 3DSearch component to prevent injection of malicious scripts. 3) Employ Web Application Firewalls (WAFs) with custom rules to detect and block typical XSS payloads targeting 3DSwymer interfaces. 4) Conduct regular security assessments and penetration tests focusing on web application vulnerabilities in 3DSwymer deployments. 5) Educate users about the risks of interacting with suspicious links or content within the platform to reduce the risk of user interaction exploitation. 6) Enable Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers accessing the platform. 7) Monitor logs and user activity for anomalous behavior indicative of exploitation attempts. 8) Segment the network to limit lateral movement if an account is compromised. These measures, combined with timely patching, will significantly reduce the risk posed by this vulnerability.