CVE-2025-67534 identifies a Cross-Site Request Forgery (CSRF) vulnerability in the Jacques Malgrange Rencontre software, specifically affecting versions up to and including 3.13.7. CSRF vulnerabilities allow attackers to trick authenticated users into submitting unwanted requests to a web application, which can lead to unauthorized actions being performed without the user's consent. In this case, the CSRF vulnerability is linked to a Stored Cross-Site Scripting (XSS) issue, meaning that the attacker can inject malicious scripts that are stored on the server and executed in the context of other users' browsers when they access the affected pages. This combination significantly raises the risk profile, as it allows attackers to hijack user sessions, steal sensitive information such as cookies or credentials, and potentially escalate privileges within the application. The vulnerability affects the Rencontre product, a software solution developed by Jacques Malgrange, with no specific affected versions listed other than those up to 3.13.7. No CVSS score has been assigned yet, and no public exploits have been reported, indicating that the vulnerability is newly disclosed and may not yet be widely exploited. The vulnerability requires that the victim be authenticated and interact with a maliciously crafted request, which is typical for CSRF attacks. The absence of patches at the time of disclosure suggests that organizations must implement interim mitigations to reduce risk. The technical details confirm the vulnerability's publication and assignment by Patchstack but provide limited additional technical specifics. Overall, this vulnerability represents a critical risk due to the potential for persistent XSS combined with CSRF, enabling attackers to perform unauthorized actions and compromise user data integrity and confidentiality.

For European organizations using Jacques Malgrange Rencontre, this vulnerability poses a significant risk to the confidentiality and integrity of user data and application functionality. Exploitation could lead to unauthorized actions performed in the context of authenticated users, including data theft, session hijacking, and potential privilege escalation. Stored XSS can facilitate persistent attacks affecting multiple users, increasing the scope of impact. Organizations handling sensitive or personal data are particularly vulnerable to reputational damage and regulatory penalties under GDPR if such data is compromised. The availability impact is lower but could occur if attackers use the vulnerability to disrupt normal application operations. Since the vulnerability requires user authentication and interaction, internal users or trusted partners could be targeted via phishing or social engineering campaigns. The lack of known exploits currently provides a window for proactive mitigation, but the threat landscape could evolve rapidly. European entities with significant user bases on Rencontre or those integrating it into critical business processes should prioritize addressing this vulnerability to avoid operational and compliance risks.

1. Monitor official channels from Jacques Malgrange for patches addressing CVE-2025-67534 and apply them immediately upon release. 2. Implement anti-CSRF tokens in all forms and state-changing requests within the Rencontre application to prevent unauthorized request forgery. 3. Conduct thorough input validation and output encoding to mitigate Stored XSS risks, ensuring that all user-supplied data is sanitized before storage and rendering. 4. Educate users about phishing and social engineering tactics that could be used to exploit CSRF vulnerabilities, emphasizing caution with unsolicited links or requests. 5. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. 6. Review and restrict user privileges to the minimum necessary to limit the potential damage from compromised accounts. 7. Use web application firewalls (WAFs) with rules designed to detect and block CSRF and XSS attack patterns targeting Rencontre. 8. Conduct regular security assessments and penetration testing focused on CSRF and XSS vectors within the application environment. 9. Log and monitor unusual user activities that may indicate exploitation attempts, enabling rapid incident response.