CVE-2026-9783 in NetVault Backup
Summary
by MITRE • 06/25/2026
Quest NetVault Backup NVBURemovableMedia SQL Injection Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Quest NetVault Backup. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed.
The specific flaw exists within the processing of NVBURemovableMedia JSON-RPC messages. The issue results from the lack of proper validation of a user-supplied string before using it to construct SQL queries. An attacker can leverage this vulnerability to execute code in the context of NETWORK SERVICE. Was ZDI-CAN-27632.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 06/25/2026
This vulnerability resides within Quest NetVault Backup's NVBURemovableMedia component which processes JSON-RPC messages for removable media operations. The flaw represents a classic sql injection vulnerability that allows remote code execution when combined with authentication bypass capabilities. The vulnerability was assigned CVE identifier and tracked as ZDI-CAN-27632, highlighting its significance in enterprise backup solutions where privileged access often translates to critical system compromise.
The technical implementation involves improper input validation within the JSON-RPC message processing pipeline where user-supplied strings are directly incorporated into SQL query construction without adequate sanitization or parameterization. This design flaw falls under CWE-89 which specifically addresses sql injection vulnerabilities, and more broadly aligns with CWE-20 which covers input validation issues. The vulnerability exists because the system fails to properly escape or parameterize user inputs before incorporating them into database queries, creating an environment where malicious payloads can manipulate query execution flow.
Attackers can exploit this vulnerability by crafting specially formatted JSON-RPC messages that contain malicious sql payloads designed to execute arbitrary commands on the target system. The authentication bypass capability significantly increases the threat surface as it removes the typical access control barriers that would normally prevent exploitation. When successfully exploited, the vulnerability allows code execution with NETWORK SERVICE privileges, which represents a critical elevation of privilege in many enterprise environments where backup systems often operate with elevated permissions to manage storage operations.
The operational impact extends beyond simple code execution as this vulnerability affects enterprise backup infrastructure that typically handles sensitive organizational data. Network service level compromise can lead to complete system takeover, data exfiltration, or disruption of critical backup operations that organizations rely upon for disaster recovery. This vulnerability directly maps to several ATT&CK techniques including T1078 for valid accounts usage and T1059 for command and scripting interpreter execution, demonstrating how this flaw can be leveraged across multiple attack phases.
Organizations should implement immediate mitigations including patching the identified vulnerability through official Quest software updates, implementing network segmentation to limit access to backup systems, and enforcing strict authentication controls. Additional defensive measures include monitoring for unusual JSON-RPC activity patterns, implementing database query auditing, and conducting regular security assessments of backup infrastructure components. The vulnerability underscores the critical importance of input validation in web services and highlights how authentication bypasses can transform previously complex exploitation scenarios into straightforward remote code execution opportunities, making it essential for security teams to address both authentication mechanisms and input sanitization controls simultaneously.