CVE-2025-53681: 
Fortimail 脆弱性の分析と軽減

CVE-2025-53681 is an SQL injection vulnerability (CWE-89) in Fortinet FortiMail's administrative portal that allows an authenticated privileged attacker to execute unauthorized code or commands via specially crafted HTTP or HTTPS requests. The vulnerability affects FortiMail versions 7.6.0 through 7.6.3, 7.4.0 through 7.4.5, and 7.2.0 through 7.2.8. It was disclosed on May 12, 2026, and was internally discovered by Jaguar Perlas of Fortinet's Burnaby InfoSec team. The CVSS v3.1 base score is 6.3 (Medium) per Fortinet's advisory, though NVD rates it 7.2 (High) (FortiGuard Advisory, Feedly).

The root cause is improper neutralization of special elements in SQL commands (CWE-89) within FortiMail's GUI/administrative portal component. An authenticated attacker with high-level (privileged) administrative access can craft malicious HTTP or HTTPS requests that inject SQL commands into backend database queries, potentially enabling arbitrary code or command execution on the underlying system. The attack vector is network-based, requires no user interaction, and has low attack complexity, but does require high privileges — limiting the attack surface to authenticated administrators or compromised admin accounts (FortiGuard Advisory).

Successful exploitation allows an authenticated privileged attacker to execute arbitrary code or commands on the FortiMail system, resulting in high confidentiality, integrity, and availability impact. This could lead to full compromise of the FortiMail appliance, exposure of email data and configurations, and potential use of the compromised system as a pivot point within the network. Given FortiMail's role as an email security gateway, a compromise could expose sensitive organizational communications and anti-spam/anti-malware configurations (FortiGuard Advisory, Feedly).

Fortinet has released patched versions to address this vulnerability. Administrators should upgrade to the following versions or later: FortiMail 7.6.4, FortiMail 7.4.6, or FortiMail 7.2.9. As a compensating control, access to the FortiMail administrative interface should be restricted to trusted networks and authorized administrators only, reducing the risk of exploitation by limiting who can reach the vulnerable endpoint (FortiGuard Advisory).

Coverage of this vulnerability has been limited, consistent with its medium severity rating and lack of active exploitation. Security news outlets such as TheCyberThrone covered it as part of Fortinet's May 2026 Patch Tuesday roundup, and the Egyptian Financial Institutions CIRT (EGFINCIRT) published a security update notice (TheCyberThrone, EGFINCIRT). No notable researcher commentary or significant social media discussion has been observed.