CVE-2025-57739 in FortiMail
Summary
by MITRE • 10/13/2026
An improper neutralization of special elements used in an SQL Command ("SQL Injection") vulnerability [CWE-89] vulnerability in Fortinet FortiMail 7.6.0 through 7.6.3, FortiMail 7.4.0 through 7.4.5, FortiMail 7.2.0 through 7.2.8 allows an authenticated attacker to execute unauthorized code or commands via specifically crafted HTTP or HTTPS requests.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified as CWE-89 represents a critical security flaw within the web application interface of Fortinet FortiMail versions ranging from 7.6.0 through 7.6.3, 7.4.0 through 7.4.5, and 7.2.0 through 7.2.8. This specific instance of SQL injection arises due to an improper neutralization of special elements used in SQL commands. Unlike many public-facing vulnerabilities that allow unauthenticated access, this flaw requires the attacker to possess valid authentication credentials for the FortiMail system. The presence of an authentication requirement significantly alters the threat landscape by limiting the attack surface to insider threats or compromised user accounts, yet it does not diminish the severity of the potential impact given the sensitive nature of email security appliances and their role in organizational infrastructure.
The technical mechanism behind this vulnerability involves insufficient sanitization or validation of user-supplied input before it is incorporated into dynamic SQL queries executed by the backend database. When an authenticated user submits data through HTTP or HTTPS requests, specifically targeting endpoints that interact with the mail queue, configuration settings, or logging databases, the application fails to properly escape special characters such as single quotes, semicolons, or comment sequences. This failure allows the attacker to inject arbitrary SQL syntax into the query structure. By carefully crafting these payloads, an attacker can manipulate the logic of the database queries, potentially bypassing intended access controls, extracting sensitive data from internal tables, modifying records, or executing administrative commands depending on the privileges associated with the database account used by the application.
From a strategic perspective, this vulnerability maps directly to MITRE ATT&CK technique T1190, which describes Exploit Public-Facing Application, although in this context it is adapted for authenticated internal exploitation scenarios often categorized under lateral movement or privilege escalation if lower-level credentials are leveraged against higher-privilege database functions. The operational impact of a successful exploit can be severe. An attacker could potentially exfiltrate confidential email content, user credentials stored within the system, or network topology information contained in configuration databases. Furthermore, depending on the backend implementation and database engine capabilities such as xp_cmdshell in Microsoft SQL Server or similar extensions in other RDBMS platforms, remote code execution may be possible, granting the attacker full control over the underlying operating system hosting FortiMail. This compromises not only the confidentiality of email communications but also the integrity and availability of the mail infrastructure, potentially allowing for further pivoting within the corporate network.
Mitigation strategies must address both immediate remediation and long-term defensive posture improvements. The primary and most effective mitigation is to apply the vendor-provided software patches immediately to upgrade FortiMail to a version where this vulnerability has been resolved. Organizations should verify their current build versions against the affected ranges listed in the advisory. In addition to patching, network segmentation plays a crucial role; ensuring that management interfaces are accessible only from trusted administrative subnets reduces the risk of exploitation even if credentials are compromised. Implementing strict input validation and parameterized queries at the application development level is essential for preventing similar flaws in future updates. Security teams should also monitor logs for anomalous SQL query patterns or unusual database activity originating from authenticated sessions, as these may indicate active exploitation attempts. Regular audits of user privileges ensure that only necessary administrative rights are granted to users interacting with the web interface, thereby limiting the blast radius if an account is compromised.