CVE-2025-53950 is a medium severity information disclosure vulnerability identified in the Fortinet FortiDLP Agent's Outlookproxy plugin, affecting versions 10.3.1 through 11.5.1 on macOS and Windows platforms. The vulnerability arises from improper handling of private personal information within the plugin, allowing an authenticated administrator to collect the current user's email data. This constitutes a privacy violation (CWE-359) as it exposes sensitive email content without appropriate safeguards. The attack vector requires local access with high privileges (administrator level) and some user interaction, limiting remote exploitation. The vulnerability impacts confidentiality but does not compromise data integrity or system availability. The CVSS 3.1 base score is 5.1, reflecting the medium risk level, with the vector indicating local attack vector (AV:L), low attack complexity (AC:L), high privileges required (PR:H), and user interaction required (UI:R). The scope is changed (S:C), meaning the vulnerability affects resources beyond the security scope of the vulnerable component. No public exploits are currently known, and no patches have been explicitly linked yet, though Fortinet is expected to release updates. FortiDLP is widely used in enterprise environments for data loss prevention, particularly in sectors handling sensitive communications such as finance, healthcare, and government. The vulnerability could allow insider threats or compromised administrators to access confidential email information, potentially leading to data breaches or regulatory compliance issues.

For European organizations, the primary impact is the unauthorized disclosure of sensitive email information, which can lead to privacy violations and potential breaches of data protection regulations such as GDPR. Organizations relying on FortiDLP for monitoring and protecting sensitive data may face reputational damage and legal consequences if email data is exposed. The requirement for authenticated administrator access limits the risk to insider threats or attackers who have already gained elevated privileges, but the potential for misuse remains significant. Confidentiality of communications is compromised, which is critical for sectors like finance, healthcare, and government agencies in Europe. While the vulnerability does not affect system integrity or availability, the exposure of private information can facilitate further attacks, social engineering, or espionage. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially in environments with weak administrative controls or insufficient monitoring.

European organizations should implement the following specific mitigations: 1) Immediately audit and restrict administrative access to FortiDLP systems, ensuring only trusted personnel have high-level privileges. 2) Monitor administrative activities and enable detailed logging to detect any unauthorized attempts to access user email data. 3) Apply Fortinet vendor patches promptly once released; maintain close communication with Fortinet support channels for updates. 4) Employ network segmentation to isolate FortiDLP management interfaces from general user networks, reducing attack surface. 5) Conduct regular security awareness training for administrators to prevent social engineering or misuse of privileges. 6) Review and harden endpoint security policies on macOS and Windows systems running FortiDLP agents, including limiting plugin capabilities where feasible. 7) Implement multi-factor authentication (MFA) for administrative accounts to reduce risk of credential compromise. 8) Perform periodic vulnerability assessments and penetration testing focused on FortiDLP deployments to identify potential exploitation paths. These steps go beyond generic advice by focusing on administrative control, monitoring, and vendor patch management tailored to this specific vulnerability.