CVE-2026-67383 in SQL Server
Summary
by MITRE • 09/08/2026
Generation of error message containing sensitive information in SQL Server allows an authorized attacker to disclose information over a network.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability described involves the improper handling of errors within Microsoft SQL Server, specifically leading to the disclosure of sensitive internal system information through generated error messages. This flaw represents a classic instance of Information Exposure, categorized under CWE-209 in the Common Weakness Enumeration framework. The core technical issue lies in the database engine's tendency to return verbose diagnostic data to the client application when an exception or operational failure occurs during query processing or administrative tasks. Instead of returning generic, non-descriptive error codes that obscure the underlying system state, SQL Server may leak details such as stack traces, internal variable states, file paths, table structures, or even partial contents of database records depending on the specific context and severity level of the triggered exception.
This behavior is particularly dangerous because it allows an authorized attacker to leverage these verbose responses for reconnaissance purposes. Even though the attacker possesses valid credentials, which limits the scope from a remote unauthenticated exploit to a post-authentication scenario, the ability to extract detailed system information significantly lowers the barrier for further exploitation. The disclosed data can reveal the specific version of SQL Server installed, including patch levels and service packs, which aids in identifying known vulnerabilities associated with that exact build. Furthermore, exposure of internal table names, column structures, or stored procedure logic provides a map of the database schema, enabling the attacker to craft more precise malicious queries for subsequent attacks such as SQL injection or privilege escalation attempts.
From an operational impact perspective, this vulnerability facilitates deeper penetration into the network infrastructure surrounding the database server. An adversary can use the leaked information to identify other potential targets within the same environment by correlating internal hostnames or IP addresses found in error messages with external-facing services. It also aids in bypassing security controls that rely on obscurity, as the attacker gains insight into how the application interacts with the backend data store. In environments where SQL Server is exposed over a network, this information leakage can accelerate the attack chain from initial access to full database compromise or lateral movement across the enterprise network.
Mitigation strategies for this vulnerability focus primarily on configuration hardening and error handling policies within both the database engine and the connecting applications. Administrators should configure SQL Server to suppress detailed error messages in production environments by adjusting server-level settings such as setting the default trace flags appropriately or configuring the max text size for errors to limit output verbosity. Application developers must implement robust exception handling mechanisms that catch these internal errors before they are returned to the end-user, replacing them with generic, user-friendly messages that do not reveal technical details. Additionally, adhering to the principle of least privilege ensures that even if information is leaked, it is restricted to what is strictly necessary for the specific role of the authenticated user. Regular auditing and monitoring should be employed to detect unusual patterns in error logs that might indicate an attacker probing for these vulnerabilities. This approach aligns with MITRE ATT&CK techniques related to Discovery, specifically T1087 Account Discovery or T1592 Gather Victim Host Information, by denying the adversary the intelligence needed to plan further malicious activities effectively.