CVE-2025-9774 is a medium-severity information disclosure vulnerability affecting RemoteClinic version 2.0. The vulnerability arises from improper handling of the 'Email' argument in the /patients/edit-patient.php endpoint. An attacker can remotely manipulate this parameter without requiring authentication or privileges, and with only user interaction, to trigger unintended information disclosure. The vulnerability does not impact integrity or availability but leaks sensitive patient information, potentially including personal health data. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:P), and low confidentiality impact (VC:L). No known exploits are currently active in the wild, but the exploit details have been publicly disclosed, increasing the risk of exploitation. The lack of patches or mitigation links suggests that the vendor has not yet released a fix, making timely defensive measures critical. This vulnerability is particularly concerning for healthcare providers using RemoteClinic 2.0, as patient confidentiality is paramount and regulatory compliance (e.g., GDPR) demands strict data protection. The attack surface is remote and unauthenticated, increasing the likelihood of exploitation if left unmitigated.

For European organizations, especially healthcare providers and clinics using RemoteClinic 2.0, this vulnerability poses a significant risk to patient data confidentiality. Unauthorized disclosure of patient emails or related personal information can lead to privacy violations, regulatory fines under GDPR, and reputational damage. The healthcare sector is a high-value target for cybercriminals due to the sensitivity of data and potential for extortion or fraud. Although the vulnerability does not directly affect system integrity or availability, the leakage of sensitive information can facilitate further attacks such as phishing or social engineering. European healthcare organizations must consider the legal implications of data breaches and the potential loss of patient trust. Additionally, given the remote and unauthenticated nature of the exploit, attackers can attempt to leverage this vulnerability at scale, increasing the threat landscape for European clinics and hospitals using this software.

1. Immediate mitigation should include implementing strict input validation and sanitization on the 'Email' parameter in /patients/edit-patient.php to prevent malicious manipulation. 2. Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious requests targeting this endpoint, especially those manipulating the Email argument. 3. Monitor web server logs for unusual access patterns or repeated attempts to access /patients/edit-patient.php with abnormal Email parameter values. 4. Restrict access to the edit-patient.php page to authenticated and authorized users only, if possible, to reduce the attack surface. 5. Engage with the RemoteClinic vendor to obtain or request an official patch and apply it promptly once available. 6. Conduct security awareness training for staff to recognize phishing attempts that may leverage leaked information. 7. Review and enhance overall application security posture, including regular code audits and penetration testing focused on input handling. 8. Ensure compliance with GDPR by having incident response plans ready in case of data leakage and promptly notifying affected individuals and authorities if a breach occurs.