CVE-2025-53950 is a medium severity information disclosure vulnerability identified in Fortinet's FortiDLP Agent, specifically within the Outlookproxy plugin used on macOS and Windows platforms. The affected versions span multiple releases from 10.3.1 through 11.5.1. The vulnerability arises from improper handling of private personal information, allowing an authenticated administrator with high privileges to collect current users' email data, thereby exposing sensitive information. The CVSS 3.1 vector indicates that the attack requires local access (AV:L), low attack complexity (AC:L), high privileges (PR:H), and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact is primarily on confidentiality (C:H), with no impact on integrity or availability. Although no known exploits are currently reported in the wild, the vulnerability represents a privacy violation that could be leveraged for insider threats or lateral movement within an organization. FortiDLP is a data loss prevention solution widely used to monitor and protect sensitive data, making this vulnerability particularly concerning for organizations relying on it to secure email communications. The issue is related to CWE-359, indicating exposure of private information due to insufficient protection mechanisms in the software's plugin.

For European organizations, this vulnerability poses a significant risk to the confidentiality of sensitive email communications, potentially leading to unauthorized disclosure of personal or corporate data. Given the strict data protection regulations in Europe, such as GDPR, any leakage of personal information can result in severe legal and financial penalties. Organizations using FortiDLP to enforce data loss prevention policies may find their trust in the product compromised, especially if administrative accounts are compromised or misused. The requirement for authenticated administrator access and user interaction limits the risk to internal threat actors or compromised admin accounts rather than external attackers. However, the exposure of email data could facilitate further attacks, including phishing or social engineering campaigns. The impact is heightened in sectors with sensitive communications, such as finance, healthcare, and government agencies. Additionally, the cross-platform nature of the vulnerability affects both macOS and Windows users, broadening the potential attack surface within diverse IT environments.

Organizations should prioritize applying vendor patches as soon as they become available to address this vulnerability. Until patches are released, it is critical to enforce strict access controls on administrative accounts, ensuring that only trusted personnel have high-level privileges. Implementing multi-factor authentication (MFA) for administrator access can reduce the risk of credential compromise. Regularly auditing and monitoring administrative activities can help detect unauthorized attempts to access user email information. Network segmentation and limiting the use of FortiDLP's Outlookproxy plugin to only necessary systems can reduce exposure. Additionally, educating administrators about the risks of this vulnerability and the importance of cautious handling of privileged accounts is essential. Organizations should also review their incident response plans to include scenarios involving insider threats exploiting such vulnerabilities. Finally, maintaining up-to-date backups and logs will assist in forensic investigations if a breach occurs.