KB5083252 — Security Update for SQL Server 2022 CU24

Overview

KB5083252 is a critical security update released on April 14, 2026, for Microsoft SQL Server 2022 Cumulative Update 24. This update addresses multiple high-severity security vulnerabilities that could potentially allow attackers to execute arbitrary code, escalate privileges, or bypass authentication mechanisms in SQL Server environments.

Security Vulnerabilities Addressed

This update resolves four critical security vulnerabilities identified in SQL Server 2022:

CVE-2026-0847: SQL Injection in System Stored Procedures

A critical SQL injection vulnerability in system stored procedures that could allow authenticated users to execute arbitrary SQL commands with elevated privileges. This vulnerability affects procedures such as sp_configure, sp_addumpdevice, and related system management functions.

CVE-2026-0848: Privilege Escalation in Database Operations

A privilege escalation vulnerability where users with limited database permissions could gain unauthorized access to sensitive database objects through improper permission validation in schema operations.

CVE-2026-0849: Memory Corruption in Query Execution

A memory corruption vulnerability in the query execution engine that could be exploited through specially crafted queries to cause denial of service or potentially execute arbitrary code.

CVE-2026-0850: Authentication Bypass in Linked Servers

An authentication bypass vulnerability in linked server connections that could allow unauthorized access to remote data sources through improper credential validation.

Affected Systems

This security update applies to the following systems:

Operating System Compatibility

• Windows Server 2019 (all editions)
• Windows Server 2022 (all editions)
• Windows 10 version 1809 and later
• Windows 11 (all versions)

Technical Details

Database Engine Security Enhancements

The update implements several security enhancements to the SQL Server database engine:

• Input Validation: Enhanced input sanitization and validation routines for system stored procedures
• Memory Protection: Improved bounds checking and buffer overflow protection in query processing
• Authentication Strengthening: Enhanced credential validation for linked server connections
• Permission Validation: Strengthened access control mechanisms for database objects

Performance Impact

The security enhancements may result in minimal performance impact:

• Query execution may be 1-3% slower due to additional validation checks
• Linked server connections may take slightly longer to establish due to enhanced authentication
• System stored procedure execution includes additional validation overhead

Installation Process

Pre-Installation Requirements

Before installing KB5083252, ensure the following requirements are met:

• SQL Server 2022 is installed and running
• Administrative privileges on the target system
• All SQL Server services can be stopped during installation
• Minimum 2 GB free disk space for installation files
• Current database backups are available

Installation Steps

1. Download the update package from Microsoft Update Catalog
2. Stop all SQL Server services using SQL Server Configuration Manager
3. Run the installation package with administrative privileges
4. Follow the installation wizard prompts
5. Restart SQL Server services after installation completes
6. Verify installation using SELECT @@VERSION query

Verification Commands

Verify the update installation using the following SQL commands:

-- Check SQL Server version
SELECT @@VERSION;

-- Verify installed updates
SELECT * FROM sys.dm_os_windows_info;

-- Check service status
SELECT servicename, status_desc FROM sys.dm_server_services;

Post-Installation Considerations

Application Compatibility

Applications using the following features may require testing after installation:

• Custom stored procedures with dynamic SQL
• Linked server connections to external data sources
• Applications using system stored procedures for configuration
• Database applications with custom authentication mechanisms

Security Configuration Review

After installation, review the following security configurations:

• Linked server connection strings and credentials
• Custom stored procedure implementations
• Database user permissions and roles
• Application connection strings and authentication methods

Enterprise Deployment

WSUS and SCCM Deployment

For enterprise environments, KB5083252 can be deployed through:

• WSUS: Configure automatic approval for SQL Server security updates
• SCCM: Create deployment packages for controlled rollout
• Group Policy: Configure automatic update policies for SQL Server systems

Testing Recommendations

Before production deployment, test the update in development and staging environments:

• Verify application functionality with updated SQL Server
• Test linked server connections and external integrations
• Validate custom stored procedure execution
• Perform load testing to assess performance impact