CVE-2025-59922: Fortinet FortiClientEMS SQLi Vulnerability

CVE-2025-59922 Overview

CVE-2025-59922 is a SQL Injection vulnerability (CWE-89) affecting Fortinet FortiClientEMS, a centralized endpoint management solution used to deploy, configure, and manage FortiClient endpoint agents across enterprise environments. The vulnerability arises from improper neutralization of special elements used in SQL commands, allowing an authenticated attacker with at least read-only admin permissions to execute unauthorized SQL code or commands via crafted HTTP or HTTPS requests.

SQL Injection vulnerabilities in endpoint management systems are particularly concerning as they can provide attackers with direct access to backend databases containing sensitive configuration data, endpoint information, and potentially credentials used for managing the enterprise security infrastructure.

Critical Impact

An authenticated attacker with minimal privileges (read-only admin) can execute arbitrary SQL commands against the backend database, potentially leading to data exfiltration, privilege escalation, or complete database compromise.

Affected Products

• Fortinet FortiClientEMS 7.4.3 through 7.4.4
• Fortinet FortiClientEMS 7.4.0 through 7.4.1
• Fortinet FortiClientEMS 7.2.0 through 7.2.10
• Fortinet FortiClientEMS 7.0 all versions

Discovery Timeline

• January 13, 2026 - CVE-2025-59922 published to NVD
• January 13, 2026 - Last updated in NVD database

Technical Details for CVE-2025-59922

Vulnerability Analysis

This SQL Injection vulnerability exists within the FortiClientEMS web interface, which handles administrative requests over HTTP and HTTPS protocols. The vulnerability allows authenticated attackers who possess at least read-only administrative permissions to inject malicious SQL statements through crafted web requests.

The improper neutralization of user-supplied input before incorporating it into SQL queries creates an opportunity for attackers to manipulate database operations. Despite requiring authentication, the low privilege threshold (read-only admin) significantly expands the potential attack surface within organizations where such permissions may be broadly distributed.

The vulnerability is network-accessible and requires no user interaction to exploit, making it exploitable remotely by any authenticated administrator within the network. Successful exploitation could result in unauthorized access to sensitive data stored in the FortiClientEMS database, modification or deletion of configuration data, and potential lateral movement within the enterprise environment.

Root Cause

The root cause of CVE-2025-59922 is the failure to properly sanitize and parameterize user input before incorporating it into SQL queries within the FortiClientEMS web application. When user-controlled data from HTTP/HTTPS requests is concatenated directly into SQL statements without proper validation or the use of prepared statements, attackers can inject malicious SQL syntax that alters the intended query logic.

This represents a fundamental input validation failure where the application trusts authenticated user input without applying the principle of defense in depth through proper input sanitization and parameterized queries.

Attack Vector

The attack is executed via the network through crafted HTTP or HTTPS requests to the FortiClientEMS management interface. An attacker must first authenticate to the system with at least read-only administrative credentials. Once authenticated, the attacker can craft malicious requests containing SQL injection payloads that target vulnerable input fields or parameters within the web application.

The SQL injection payloads can be designed to extract sensitive information from the database (UNION-based or blind SQL injection), modify existing data, or potentially execute operating system commands depending on the database configuration and permissions. The attack requires no user interaction beyond the initial authentication, allowing for automated exploitation once access is obtained.

Detection Methods for CVE-2025-59922

Indicators of Compromise

• Unusual SQL error messages or database exceptions appearing in FortiClientEMS application logs
• Suspicious HTTP/HTTPS requests containing SQL syntax characters (e.g., single quotes, semicolons, UNION statements, comment sequences)
• Unexpected database queries or query patterns in database audit logs
• Anomalous administrative session activity, particularly from read-only admin accounts

Detection Strategies

• Deploy web application firewall (WAF) rules to detect and block common SQL injection patterns in requests to FortiClientEMS
• Enable detailed logging on the FortiClientEMS application and monitor for SQL-related errors or exceptions
• Implement database activity monitoring to detect unusual query patterns or unauthorized data access attempts
• Configure SIEM rules to correlate authentication events with subsequent suspicious web request patterns

Monitoring Recommendations

• Monitor FortiClientEMS access logs for requests containing SQL metacharacters and injection patterns
• Establish baseline behavior for administrative accounts and alert on deviations, particularly for read-only admin accounts
• Review database audit logs regularly for evidence of data exfiltration or schema enumeration attempts
• Implement network traffic analysis to identify unusual data volumes being transmitted from the FortiClientEMS server

How to Mitigate CVE-2025-59922

Immediate Actions Required

• Review and restrict read-only admin permissions to only essential personnel while awaiting patch deployment
• Implement network segmentation to limit access to the FortiClientEMS management interface
• Deploy web application firewall rules to filter SQL injection attack patterns targeting FortiClientEMS
• Enable comprehensive logging and monitoring for the FortiClientEMS application and underlying database
• Audit current administrative accounts to identify any potentially compromised credentials

Patch Information

Fortinet has published a security advisory for this vulnerability. Organizations should consult the Fortinet PSIRT Advisory FG-IR-25-735 for detailed patch information and upgrade instructions. Affected organizations should prioritize upgrading to a patched version of FortiClientEMS as soon as updates become available.

Workarounds

• Restrict network access to the FortiClientEMS management interface using firewall rules to allow only trusted IP addresses
• Implement additional authentication layers (e.g., VPN, jump hosts) for accessing the FortiClientEMS administrative interface
• Reduce the number of accounts with any administrative permissions, including read-only admin roles
• Deploy a reverse proxy with SQL injection filtering capabilities in front of the FortiClientEMS web interface

# Example: Restrict FortiClientEMS management access to specific trusted networks
# Add firewall rules to limit access to the EMS management port

# Linux iptables example
iptables -A INPUT -p tcp --dport 8013 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 8013 -j DROP

# Verify FortiClientEMS service configuration and review access logs
tail -f /var/log/forticlient-ems/access.log | grep -i "sql\|union\|select"