CVE-2025-31365 is a code injection vulnerability classified under CWE-94 affecting Fortinet's FortiClientMac software versions 7.4.0 through 7.4.3 and 7.2.1 through 7.2.8. The flaw arises from improper control over code generation, enabling an attacker to inject and execute arbitrary code or commands on the victim's Mac host. Exploitation requires no authentication but depends on user interaction, specifically the victim visiting a maliciously crafted website that triggers the vulnerability. The vulnerability impacts confidentiality, integrity, and availability by potentially allowing attackers to run unauthorized code, which could lead to data leakage, system compromise, or disruption of services. The CVSS v3.1 base score is 5.5, reflecting medium severity due to network attack vector, high attack complexity, no privileges required, but requiring user interaction and having limited impact on confidentiality, integrity, and availability. No public exploits or patches are currently documented, indicating the vulnerability is newly disclosed. FortiClientMac is widely used in enterprise environments for endpoint protection, making this vulnerability a concern for organizations relying on Fortinet's security suite on Mac devices. The vulnerability's scope is limited to Mac endpoints running the affected versions, and the attack surface is primarily web-based vectors. The vulnerability's state is published, and organizations should monitor Fortinet advisories for patches.

For European organizations, this vulnerability poses a risk to endpoint security on Mac devices protected by FortiClientMac. Successful exploitation could lead to unauthorized code execution, enabling attackers to steal sensitive data, install malware, or disrupt operations. This is particularly critical for sectors handling sensitive information such as finance, healthcare, government, and critical infrastructure. The requirement for user interaction reduces the likelihood of widespread automated exploitation but does not eliminate targeted phishing or watering hole attacks. The medium severity score reflects moderate risk; however, the potential for lateral movement and persistence after exploitation could amplify impact. Organizations with remote or hybrid workforces using Mac endpoints are especially vulnerable due to increased exposure to malicious websites. The lack of known exploits currently limits immediate risk but also means organizations must act proactively. Failure to address this vulnerability could result in data breaches, regulatory non-compliance under GDPR, and reputational damage.

1. Monitor Fortinet's official channels for security advisories and apply patches or updates to FortiClientMac as soon as they become available. 2. Implement strict web filtering policies to block access to known malicious or untrusted websites, reducing the risk of user interaction with exploit sites. 3. Conduct targeted user awareness training focusing on phishing and social engineering tactics to minimize the chance of users visiting malicious URLs. 4. Employ endpoint detection and response (EDR) solutions capable of detecting anomalous behavior indicative of code injection or unauthorized execution on Mac devices. 5. Use network segmentation to limit the impact of a compromised endpoint and restrict lateral movement within the corporate network. 6. Regularly audit and review FortiClientMac configurations to ensure security features are enabled and up to date. 7. Consider deploying browser security extensions or sandboxing technologies to isolate web content and reduce exposure to malicious code. 8. Maintain comprehensive logging and monitoring to detect early signs of exploitation attempts.