CVE-2026-67370 in SQL Server
Summary
by MITRE • 09/08/2026
Improper neutralization of special elements used in an sql command ('sql injection') in SQL Server allows an authorized attacker to elevate privileges over a network.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability described constitutes a classic instance of improper neutralization of special elements within database commands, commonly known as SQL Injection. This flaw arises when the application or underlying system fails to properly sanitize user-supplied input before incorporating it into dynamic SQL statements executed by Microsoft SQL Server. In this specific context, the failure occurs in a manner that allows an authenticated attacker to manipulate the structure of these queries. By injecting maliciously crafted SQL code through network-accessible interfaces, the adversary can bypass intended logic controls and execute arbitrary commands with elevated privileges. This represents a critical breakdown in input validation mechanisms where special characters such as single quotes, semicolons, or comment markers are not adequately escaped or parameterized, thereby allowing them to alter the interpretation of the command by the database engine.
From a technical perspective, this vulnerability leverages the ability of SQL parsers to interpret injected strings as executable code rather than data literals. When an authorized user provides input that is directly concatenated into a query string without proper sanitization, the attacker can close the original argument and append new commands. For instance, if the application constructs a query like SELECT * FROM users WHERE id = 'input', an attacker might supply an input such as 1' OR '1'='1 to retrieve all records or further extend this payload with UNION-based techniques to extract sensitive data from other tables. In more severe cases involving SQL Server, particularly older versions or specific configurations, these injection points can be exploited to execute system-level commands via extended stored procedures like xp_cmdshell, provided the database service account has sufficient permissions on the operating system. This effectively transforms a simple authentication bypass into full remote code execution capabilities under the context of the database process.
The operational impact of this vulnerability is severe due to its potential for privilege escalation and data exfiltration. Since the attacker already possesses authorized access, they can exploit this flaw to escalate their privileges from standard user roles to administrative levels such as sysadmin or db_owner. This elevation grants unrestricted control over the SQL Server instance, allowing the modification, deletion, or theft of any database content. Furthermore, if the underlying service account is configured with high-level operating system permissions, the attacker can compromise the entire server infrastructure, leading to a complete breach of confidentiality, integrity, and availability for all systems connected to that network segment. The ability to execute commands over the network means this exploitation does not require physical access or local shell access on the target machine, making it highly scalable across enterprise environments where SQL Server is deployed as a central data repository.
To mitigate this risk, organizations must implement strict input validation and parameterized queries for all database interactions. Parameterization ensures that user inputs are treated strictly as data values rather than executable code, neutralizing the injection vector entirely. Additionally, adhering to the principle of least privilege is crucial; database service accounts should operate with minimal permissions necessary for their function, avoiding high-level OS privileges unless absolutely required and even then only in isolated environments. Regular security assessments including static application security testing (SAST) and dynamic application security testing (DAST) can help identify such vulnerabilities early in the development lifecycle. Furthermore, deploying Web Application Firewalls or database activity monitoring tools can provide an additional layer of defense by detecting anomalous SQL patterns indicative of injection attempts.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-89, which specifically addresses Improper Neutralization of Special Elements used in an SQL Command. In the context of the MITRE ATT&CK framework, this exploitation technique falls under T1190 Exploit Public-Facing Application and potentially T1059 Command and Scripting Interpreter if system commands are executed via stored procedures. The attack vector is classified as Network-based with low complexity but requires authentication, highlighting that even authenticated users pose a significant threat when input validation controls are insufficient. Addressing this issue requires a comprehensive approach combining secure coding practices, rigorous testing protocols, and robust configuration management to ensure that SQL Server instances remain resilient against injection attacks despite existing network access by authorized personnel.