CVE-2026-47295: SQL Server Privilege Escalation Flaw

CVE-2026-47295 Overview

CVE-2026-47295 is a SQL injection vulnerability in Microsoft SQL Server that allows an authenticated attacker to elevate privileges over a network. The flaw stems from improper neutralization of special elements in SQL commands, classified as [CWE-89]. An attacker with low-privileged access can inject malicious SQL statements that the database engine executes with elevated context. Successful exploitation compromises the confidentiality, integrity, and availability of the affected SQL Server instance. Microsoft published the advisory on July 14, 2026.

Critical Impact
An authorized attacker can escalate privileges over a network, gaining high-impact control over data, transactions, and server availability within the SQL Server instance.

Affected Products

Microsoft SQL Server (specific version details available in the Microsoft Security Response Center advisory)

Discovery Timeline

2026-07-14 - CVE-2026-47295 published to NVD
2026-07-15 - Last updated in NVD database

Technical Details for CVE-2026-47295

Vulnerability Analysis

The vulnerability exists because SQL Server fails to properly neutralize special characters passed within SQL commands. An authenticated user submits crafted input that breaks out of intended query context. The database engine parses and executes the attacker-controlled statements as part of the original query. Because the exploit requires only low-privilege authentication and no user interaction, any account with query submission rights becomes a viable attack vector.

The Exploit Prediction Scoring System (EPSS) places this vulnerability at the 56th percentile, indicating a moderate probability of exploitation activity relative to other published CVEs. No public proof-of-concept has been observed, and the flaw is not listed in the CISA Known Exploited Vulnerabilities catalog as of publication.

Root Cause

The root cause is improper input neutralization within SQL command processing, corresponding to [CWE-89]. User-supplied data is concatenated or interpolated into SQL statements without sufficient sanitization or parameterization. Attackers exploit this to alter query logic and invoke operations reserved for higher-privileged roles.

Attack Vector

The attack is delivered over the network against an accessible SQL Server endpoint. The attacker must hold valid credentials with basic query privileges. By submitting a crafted SQL payload through an application interface or direct database connection, the attacker escapes the intended query boundary. The injected statements execute with the privileges of the SQL Server session context, enabling privilege escalation, data extraction, and modification.

// No verified proof-of-concept code is publicly available for this CVE.
// Refer to the Microsoft Security Response Center advisory for technical details.

Detection Methods for CVE-2026-47295

Indicators of Compromise

Unexpected SQL statements in SQL Server audit logs containing concatenated payloads, comment sequences (--, /* */), or stacked queries (;)
Sudden changes to user role membership, permissions grants, or sysadmin assignments
Authenticated sessions issuing queries that reference system catalog views or extended stored procedures outside normal application behavior

Detection Strategies

Enable SQL Server Audit and forward events to a centralized log platform for correlation and anomaly analysis
Baseline normal query patterns per application account and alert on deviations such as xp_cmdshell invocation or dynamic SQL execution
Deploy database activity monitoring rules that flag suspicious tautologies (OR 1=1), UNION-based injection, and time-based blind injection patterns

Monitoring Recommendations

Continuously monitor privilege changes on SQL Server logins and database roles
Track failed and successful logins from unexpected source IPs, especially service accounts
Correlate application-tier request logs with database query logs to identify injection attempts that reach the backend

How to Mitigate CVE-2026-47295

Immediate Actions Required

Apply the Microsoft security update referenced in the Microsoft Security Update CVE-2026-47295 advisory
Inventory all SQL Server instances and prioritize patching internet-exposed and business-critical databases first
Rotate credentials for accounts that may have been abused if suspicious activity is identified in audit logs

Patch Information

Microsoft has released a security update addressing CVE-2026-47295. Consult the Microsoft Security Update CVE-2026-47295 advisory for build numbers, download links, and supported SQL Server versions.

Workarounds

Enforce parameterized queries and stored procedures in application code to prevent injectable input from reaching the database
Apply the principle of least privilege to SQL Server logins and remove unnecessary elevated role memberships
Restrict network access to SQL Server through firewall rules, private endpoints, or VPN gateways to limit exposure
Disable unused features such as xp_cmdshell and CLR integration to reduce post-exploitation options

bash

# Example: restrict a SQL Server login to least privilege
# Remove elevated role membership and grant only required permissions
ALTER SERVER ROLE sysadmin DROP MEMBER [app_login];
USE [AppDatabase];
ALTER ROLE db_datareader ADD MEMBER [app_login];
ALTER ROLE db_datawriter ADD MEMBER [app_login];