CVE-2026-5322: mcp-data-vis SQL Injection Vulnerability

CVE-2026-5322 Overview

A SQL injection vulnerability has been identified in AlejandroArciniegas mcp-data-vis, specifically affecting the Request function within the src/servers/database/server.js file of the MCP Handler component. This vulnerability allows remote attackers to manipulate SQL queries through improper input handling, potentially leading to unauthorized data access, modification, or deletion.

Critical Impact

Remote attackers can exploit this SQL injection flaw to bypass authentication, extract sensitive data, or manipulate database contents without requiring user interaction or prior authentication.

Affected Products

• AlejandroArciniegas mcp-data-vis (commit bc597e391f184d2187062fd567599a3cb72adf51)
• AlejandroArciniegas mcp-data-vis (commit de5a51525a69822290eaee569a1ab447b490746d)
• MCP Handler component in src/servers/database/server.js

Discovery Timeline

• 2026-04-02 - CVE-2026-5322 published to NVD
• 2026-04-02 - Last updated in NVD database

Technical Details for CVE-2026-5322

Vulnerability Analysis

This vulnerability resides in the MCP Handler component of the mcp-data-vis application, specifically within the Request function located in src/servers/database/server.js. The flaw stems from improper neutralization of special elements used in SQL commands (CWE-74), allowing attackers to inject malicious SQL statements through user-controllable input.

The mcp-data-vis project uses a rolling release model for continuous updates, which means traditional version-based tracking is not available. This deployment model can complicate patch management and vulnerability tracking for organizations using this software.

The exploit has been publicly disclosed and may be actively used by threat actors. The vendor was contacted regarding this vulnerability but did not respond, leaving the security issue potentially unaddressed.

Root Cause

The root cause of this vulnerability is inadequate input validation and sanitization in the Request function of the MCP Handler. User-supplied input is concatenated directly into SQL queries without proper parameterization or escaping, enabling attackers to break out of the intended query context and inject arbitrary SQL commands. This represents a classic SQL injection pattern where untrusted data flows directly into database operations.

Attack Vector

The attack can be initiated remotely over the network without requiring any authentication or user interaction. An attacker can craft malicious requests to the MCP Handler endpoint, embedding SQL injection payloads within request parameters. When processed by the vulnerable Request function, these payloads execute against the underlying database.

The vulnerability mechanism involves unsanitized user input being passed to database query functions. When the MCP Handler processes incoming requests, user-controllable data is incorporated into SQL statements without proper escaping or parameterized queries. This allows attackers to terminate the original query and append additional malicious SQL commands. For technical exploitation details, refer to the GitHub Issue Discussion and VulDB Vulnerability Details.

Detection Methods for CVE-2026-5322

Indicators of Compromise

• Unusual SQL error messages in application logs indicating syntax errors or injection attempts
• Database query logs showing unexpected UNION SELECT, DROP, INSERT, or UPDATE statements
• Abnormal database access patterns, particularly bulk data extraction operations
• Web application firewall alerts for SQL injection signature matches targeting the MCP Handler endpoint

Detection Strategies

• Implement web application firewall (WAF) rules to detect common SQL injection patterns in requests to /servers/database/ endpoints
• Monitor application logs for SQL syntax errors and database exceptions originating from the server.js component
• Deploy database activity monitoring to identify anomalous queries or unauthorized data access attempts
• Configure intrusion detection systems (IDS) to alert on SQL injection payloads in network traffic

Monitoring Recommendations

• Enable detailed logging for the MCP Handler component to capture all incoming requests and database operations
• Set up alerting for failed authentication attempts or access control violations following suspicious database queries
• Implement real-time database query analysis to detect injection patterns before execution
• Review access logs for the src/servers/database/server.js endpoint for unusual request patterns or volumes

How to Mitigate CVE-2026-5322

Immediate Actions Required

• Restrict network access to the MCP Handler endpoint until a patch is available
• Implement input validation and sanitization at the application perimeter using a WAF
• Review and audit all database queries in the Request function for proper parameterization
• Consider temporarily disabling the affected MCP Handler functionality if not critical to operations

Patch Information

The vendor has not responded to disclosure attempts, and no official patch is currently available. Organizations should monitor the VulDB Vulnerability Details page and the project repository for any security updates. Due to the rolling release model used by this product, users should regularly pull the latest commits and review changes to src/servers/database/server.js for security improvements.

Workarounds

• Deploy a web application firewall with SQL injection protection rules in front of the vulnerable endpoint
• Implement strict input validation at the network perimeter to reject requests containing SQL metacharacters
• Use database account privileges principle of least privilege to limit the impact of successful injection attacks
• Consider implementing prepared statements or parameterized queries by modifying the vulnerable code directly

# Configuration example - WAF rule to block SQL injection attempts
# ModSecurity rule example for Apache/Nginx
SecRule ARGS "@detectSQLi" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'SQL Injection Attempt Detected for mcp-data-vis endpoint',\
    logdata:'Matched Data: %{MATCHED_VAR} found within %{MATCHED_VAR_NAME}'"