CVE-2026-2682: Tsinghua Unigroup SQL Injection Flaw

CVE-2026-2682 Overview

A SQL Injection vulnerability has been discovered in Tsinghua Unigroup Electronic Archives System affecting versions up to 3.2.210802(62532). The vulnerability exists in the /mine/PublicReport/prinReport.html?token=java endpoint, where improper handling of the comid parameter allows attackers to inject malicious SQL statements. This flaw can be exploited remotely by authenticated attackers to manipulate database queries, potentially leading to unauthorized data access, modification, or deletion.

Critical Impact

Remote attackers can exploit this SQL Injection vulnerability to extract sensitive data from the archives system database, potentially compromising confidential organizational records and documents stored within the electronic archives platform.

Affected Products

• Tsinghua Unigroup Electronic Archives System up to version 3.2.210802(62532)

Discovery Timeline

• 2026-02-18 - CVE-2026-2682 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2026-2682

Vulnerability Analysis

This vulnerability is classified as CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), commonly manifesting as an injection flaw. The Electronic Archives System fails to properly sanitize user-supplied input in the comid parameter before incorporating it into SQL queries. This allows attackers to break out of the intended query structure and execute arbitrary SQL commands against the backend database.

The network-based attack vector means exploitation can occur remotely without requiring physical access to the target system. The vulnerability requires low-privilege authentication to exploit, indicating that any authenticated user could potentially leverage this flaw to escalate their database access beyond their intended permissions.

Root Cause

The root cause of this vulnerability lies in inadequate input validation and the lack of parameterized queries or prepared statements in the affected endpoint. When user input from the comid parameter is directly concatenated into SQL queries without proper sanitization or escaping, it creates an opportunity for SQL injection attacks. The application fails to treat user input as untrusted data, allowing specially crafted input to alter the logic of database queries.

Attack Vector

The attack exploits the /mine/PublicReport/prinReport.html endpoint, specifically targeting the comid parameter. An authenticated attacker can craft malicious HTTP requests containing SQL injection payloads in this parameter. Since the endpoint accepts a token parameter for authentication (using java as the token value in the vulnerable path), attackers with valid session credentials can manipulate database queries to extract data, bypass access controls, or potentially modify database contents.

The vulnerability is exploited through manipulation of the comid parameter in HTTP requests to the vulnerable endpoint. Attackers can inject SQL syntax that breaks out of the intended query context, allowing them to append additional SQL commands or modify query logic. A proof-of-concept demonstrating this exploitation technique has been publicly disclosed. For technical details, refer to the GitHub PoC Script.

Detection Methods for CVE-2026-2682

Indicators of Compromise

• Unusual or malformed requests to /mine/PublicReport/prinReport.html containing SQL syntax characters such as single quotes, semicolons, or UNION statements in the comid parameter
• Database error messages appearing in HTTP responses that reveal query structure or database information
• Unexpected database queries originating from the web application containing injection patterns
• Anomalous data access patterns showing retrieval of data outside normal user permissions

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in HTTP request parameters
• Monitor application logs for requests to the vulnerable endpoint with suspicious parameter values
• Deploy database activity monitoring to identify anomalous query patterns or unauthorized data access attempts
• Utilize intrusion detection systems (IDS) configured with SQL injection signature rules

Monitoring Recommendations

• Enable detailed logging for all requests to the /mine/PublicReport/ directory
• Configure alerting for database errors that may indicate failed SQL injection attempts
• Monitor for high volumes of requests to the vulnerable endpoint from single IP addresses
• Review database audit logs for queries containing unexpected UNION, SELECT, or other SQL keywords

How to Mitigate CVE-2026-2682

Immediate Actions Required

• Restrict network access to the Electronic Archives System to trusted IP ranges only
• Implement Web Application Firewall rules to filter SQL injection patterns in the comid parameter
• Disable or restrict access to the /mine/PublicReport/prinReport.html endpoint if not business-critical
• Review database permissions to ensure the application uses least-privilege database accounts

Patch Information

The vendor (Tsinghua Unigroup) was contacted about this vulnerability but did not respond. No official patch is currently available from the vendor. Organizations using affected versions should implement workarounds and compensating controls until a patch is released. Monitor vendor communications and the VulDB advisory for updates on remediation options.

Workarounds

• Deploy a Web Application Firewall (WAF) with rules specifically blocking SQL injection attempts targeting the comid parameter
• Implement input validation at the network perimeter to filter requests containing SQL metacharacters
• Consider isolating the Electronic Archives System on a segmented network with restricted access
• If source code access is available, implement parameterized queries or prepared statements as a code-level fix

# Example WAF rule configuration (ModSecurity format)
SecRule ARGS:comid "@detectSQLi" "id:1001,phase:2,deny,status:403,msg:'SQL Injection attempt blocked in comid parameter'"