CVE-2025-62846: QHora QuRouter SQL Injection Vulnerability

CVE-2025-62846 Overview

An SQL injection vulnerability has been identified in QNAP QHora routers running QuRouter firmware. This security flaw allows a local attacker who has already gained administrator-level access to exploit the vulnerability and execute unauthorized code or commands on the affected device. The vulnerability exists due to improper sanitization of user-supplied input in database queries within the router's management interface.

Critical Impact

Authenticated administrators can leverage SQL injection to execute arbitrary code or commands, potentially compromising the entire network infrastructure managed by the affected QHora device.

Affected Products

• QNAP QHora routers running QuRouter firmware versions prior to 2.6.2.007
• QuRouter firmware versions before 2.6.2.007

Discovery Timeline

• 2026-03-20 - CVE CVE-2025-62846 published to NVD
• 2026-03-24 - Last updated in NVD database

Technical Details for CVE-2025-62846

Vulnerability Analysis

This vulnerability is classified as CWE-89 (SQL Injection), which occurs when user-controllable input is incorporated into database queries without proper neutralization. In the context of QNAP QHora routers, the vulnerability requires local access and administrative privileges to exploit, which limits the initial attack surface. However, once exploited, the attacker can execute unauthorized code or commands on the underlying system.

The local attack vector with high privilege requirements indicates that an attacker would need to first compromise an administrator account through other means (such as credential theft, social engineering, or session hijacking) before being able to leverage this SQL injection flaw. Despite these prerequisites, the potential impact is severe as successful exploitation grants the attacker the ability to execute arbitrary commands with elevated system privileges.

Root Cause

The root cause of this vulnerability lies in improper input validation and sanitization within the QuRouter firmware's database interaction layer. User-supplied input from administrative functions is being directly concatenated or interpolated into SQL queries without adequate parameterization or escaping, allowing specially crafted input to modify the intended query logic.

SQL injection vulnerabilities typically arise when:

• Dynamic SQL queries are constructed using string concatenation
• User input is not properly validated against expected formats
• Parameterized queries or prepared statements are not utilized
• Input sanitization fails to account for all SQL metacharacters

Attack Vector

The attack requires local access to the QHora device with administrative credentials. Once authenticated, an attacker can inject malicious SQL statements through vulnerable input fields within the router's management interface. The injected SQL code can then be used to:

• Extract sensitive information from the device's database
• Modify configuration data stored in the database
• Execute system-level commands through SQL features like xp_cmdshell equivalents or user-defined functions
• Escalate privileges beyond the intended administrative scope

The vulnerability's local attack vector means the attacker must either have physical access to the network where the QHora device is deployed or have already established a foothold through remote compromise.

Detection Methods for CVE-2025-62846

Indicators of Compromise

• Unusual database query patterns or errors in system logs indicating malformed SQL statements
• Unexpected command execution or process spawning originating from router management services
• Anomalous administrative session activity, particularly input containing SQL metacharacters such as single quotes, semicolons, or SQL keywords
• System configuration changes that were not authorized by legitimate administrators

Detection Strategies

• Monitor administrative interface access logs for suspicious input patterns containing SQL injection signatures
• Implement database query logging to detect unusual or malformed queries
• Deploy network monitoring to identify anomalous traffic patterns from the QHora device
• Review authentication logs for compromised or suspicious administrator account activity

Monitoring Recommendations

• Enable comprehensive logging on QNAP QHora devices and forward logs to a centralized SIEM solution
• Configure alerts for administrative actions that deviate from baseline behavior
• Implement file integrity monitoring on critical system configurations
• Regularly audit administrator accounts and access patterns for signs of compromise

How to Mitigate CVE-2025-62846

Immediate Actions Required

• Update QuRouter firmware to version 2.6.2.007 or later immediately
• Audit all administrator accounts for unauthorized access or credential compromise
• Review system logs for any indicators of prior exploitation attempts
• Restrict administrative access to trusted networks and IP addresses only
• Implement strong, unique passwords for all administrative accounts

Patch Information

QNAP has addressed this vulnerability in QuRouter version 2.6.2.007 and later releases. Administrators should update their QHora devices to the patched firmware version as soon as possible. For detailed information and download links, refer to the QNAP Security Advisory QSA-26-12.

Workarounds

• Limit administrative interface access to trusted internal networks only using firewall rules
• Implement network segmentation to isolate QHora management interfaces from general network traffic
• Enable multi-factor authentication for administrative access if supported
• Regularly rotate administrator credentials and enforce strong password policies
• Monitor for suspicious administrative activity until the patch can be applied