CVE-2026-40900: DataEase SQL Injection Vulnerability

CVE-2026-40900 Overview

DataEase is an open-source data visualization and analytics platform. A critical SQL injection vulnerability has been identified in versions 2.10.20 and below affecting the /de2api/datasetData/previewSql endpoint. The vulnerability allows authenticated attackers to execute arbitrary stacked SQL statements against connected databases, achieving full read and write access to underlying data stores.

Critical Impact

Authenticated attackers with access to valid datasource credentials can achieve full read and write access to the underlying database, enabling data exfiltration, modification, and potential complete database compromise.

Affected Products

• DataEase versions 2.10.20 and below
• DataEase installations using the /de2api/datasetData/previewSql endpoint
• Database connections configured with JDBC that allow allowMultiQueries=true

Discovery Timeline

• 2026-04-16 - CVE CVE-2026-40900 published to NVD
• 2026-04-16 - Last updated in NVD database

Technical Details for CVE-2026-40900

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) exists in the DataEase data visualization platform's SQL preview functionality. The vulnerability stems from the application wrapping user-supplied SQL within a subquery without proper validation to ensure the input consists of only a single SELECT statement. This design flaw, combined with a JDBC blocklist bypass that permits enabling allowMultiQueries=true, creates a dangerous attack surface.

An attacker can exploit this weakness to break out of the intended subquery context and execute arbitrary stacked SQL statements. This includes not only SELECT queries for data exfiltration but also UPDATE, DELETE, INSERT, and other write operations against the connected database.

Root Cause

The root cause of this vulnerability is insufficient input validation in the /de2api/datasetData/previewSql endpoint. The application fails to validate that user-supplied SQL input contains only a single SELECT statement before wrapping it in a subquery. Additionally, the JDBC connection parameter blocklist can be bypassed to enable allowMultiQueries=true, which permits multiple SQL statements to be executed in a single request.

Attack Vector

The attack is network-based and requires low privileges—an authenticated user with access to valid datasource credentials can exploit this vulnerability. The attacker submits a malicious SQL payload to the /de2api/datasetData/previewSql endpoint that breaks out of the subquery wrapper using SQL statement terminators. By leveraging the allowMultiQueries=true JDBC configuration bypass, the attacker can then append and execute additional arbitrary SQL statements including data modification operations.

The exploitation flow involves:

1. Authenticating to the DataEase platform with valid credentials
2. Crafting a SQL payload that terminates the intended subquery
3. Appending additional SQL statements (UPDATE, INSERT, DELETE, etc.)
4. Submitting the payload to the vulnerable endpoint
5. The backend executes all stacked statements against the connected database

Detection Methods for CVE-2026-40900

Indicators of Compromise

• Unusual or malformed SQL queries in database logs containing semicolons followed by additional statements
• HTTP requests to /de2api/datasetData/previewSql containing SQL injection patterns such as '; UPDATE, '; DELETE, or '; INSERT
• Database audit logs showing unexpected write operations originating from DataEase application connections
• JDBC connection strings containing allowMultiQueries=true parameter modifications

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in requests to the DataEase API endpoints
• Enable database query logging and audit trails to capture all SQL statements executed against connected databases
• Monitor for anomalous API activity patterns, particularly bulk requests to the /de2api/datasetData/previewSql endpoint
• Deploy runtime application self-protection (RASP) solutions to detect SQL injection attempts at the application layer

Monitoring Recommendations

• Configure SIEM alerts for SQL injection attack signatures targeting DataEase endpoints
• Establish baseline database activity patterns and alert on deviations, particularly unexpected write operations
• Monitor DataEase application logs for authentication events followed by suspicious SQL preview requests
• Review database user privilege escalation attempts and unexpected schema modifications

How to Mitigate CVE-2026-40900

Immediate Actions Required

• Upgrade DataEase to version 2.10.21 or later immediately
• Review database audit logs for any signs of exploitation or unauthorized data access
• Rotate all database credentials used by DataEase datasource connections
• Implement network segmentation to limit database access from the DataEase application tier

Patch Information

DataEase has addressed this vulnerability in version 2.10.21. Organizations should upgrade immediately to remediate this SQL injection flaw. For detailed release information, see the GitHub Release v2.10.21. Additional technical details are available in the GitHub Security Advisory GHSA-vqxf-84ph-j3vx.

Workarounds

• Restrict access to the /de2api/datasetData/previewSql endpoint to only trusted users until patching is complete
• Implement strict input validation at the WAF or reverse proxy layer to block SQL injection patterns
• Configure database accounts used by DataEase with minimal required privileges (read-only where possible)
• Disable or restrict JDBC connection parameter modifications through network-level controls

# Example: Restrict DataEase API access using nginx
location /de2api/datasetData/previewSql {
    # Limit access to trusted IP ranges only
    allow 10.0.0.0/8;
    deny all;
    
    # Additional rate limiting
    limit_req zone=api_limit burst=5 nodelay;
}