CVE-2026-2820: Fujian Smart Platform SQLi Vulnerability

CVE-2026-2820 Overview

A SQL Injection vulnerability has been discovered in Fujian Smart Integrated Management Platform System versions up to 7.5. This security flaw affects the file /Module/CRXT/Controller/XAccessPermissionPlus.ashx where manipulation of the DeviceIDS argument enables SQL injection attacks. The vulnerability can be exploited remotely without authentication, and a public exploit has been released, increasing the risk of active exploitation attempts against vulnerable systems.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to extract sensitive data, modify database contents, or potentially gain unauthorized access to backend systems through the publicly accessible management platform endpoint.

Affected Products

• Fujian Smart Integrated Management Platform System version 7.5 and earlier
• Systems utilizing the /Module/CRXT/Controller/XAccessPermissionPlus.ashx endpoint
• Deployments with externally accessible management interfaces

Discovery Timeline

• 2026-02-20 - CVE-2026-2820 published to NVD
• 2026-02-20 - Last updated in NVD database

Technical Details for CVE-2026-2820

Vulnerability Analysis

This vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), which encompasses injection flaws where user-controlled input is improperly sanitized before being used in commands or queries. The vulnerability exists in the XAccessPermissionPlus.ashx handler, which processes device-related access permission requests. When the application receives data through the DeviceIDS parameter, it fails to properly sanitize or parameterize the input before incorporating it into SQL queries, allowing attackers to inject malicious SQL statements.

The network-accessible nature of this endpoint means attackers can exploit the vulnerability remotely without requiring any prior authentication or user interaction. Successful exploitation could allow unauthorized data retrieval, data modification, or in severe cases, complete database compromise depending on the database permissions and configuration.

Root Cause

The root cause is improper input validation and lack of parameterized queries in the XAccessPermissionPlus.ashx controller. The DeviceIDS parameter is directly concatenated into SQL statements without proper sanitization, allowing special SQL characters and commands to be interpreted by the database engine rather than treated as literal data values.

Attack Vector

The attack vector is network-based, requiring no authentication or user interaction. An attacker can send crafted HTTP requests to the /Module/CRXT/Controller/XAccessPermissionPlus.ashx endpoint with malicious SQL payloads in the DeviceIDS parameter. The attack requires low complexity to execute, as standard SQL injection techniques can be applied.

The vulnerability can be exploited by submitting specially crafted values in the DeviceIDS parameter that include SQL metacharacters and additional SQL statements. When processed by the vulnerable handler, these injected commands are executed against the backend database. Technical details and a proof-of-concept Python script are available through the GitHub PoC repository.

Detection Methods for CVE-2026-2820

Indicators of Compromise

• Unusual or malformed requests to /Module/CRXT/Controller/XAccessPermissionPlus.ashx containing SQL syntax characters
• Web server logs showing requests with SQL keywords (UNION, SELECT, INSERT, DELETE, DROP) in the DeviceIDS parameter
• Database logs indicating failed queries or unexpected query patterns originating from the web application
• Anomalous database access patterns such as bulk data retrieval or schema enumeration attempts

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in requests to the affected endpoint
• Deploy network intrusion detection signatures targeting SQL injection attempts in HTTP traffic
• Enable detailed logging on the web server for requests containing special characters in query parameters
• Configure database activity monitoring to alert on unusual query patterns or access to sensitive tables

Monitoring Recommendations

• Monitor access logs for the /Module/CRXT/Controller/XAccessPermissionPlus.ashx endpoint for unusual request volumes or patterns
• Set up alerts for database errors or exceptions that may indicate injection attempts
• Review application logs for authentication bypass attempts or unauthorized data access
• Implement real-time monitoring of outbound network traffic for potential data exfiltration

How to Mitigate CVE-2026-2820

Immediate Actions Required

• Restrict network access to the /Module/CRXT/Controller/XAccessPermissionPlus.ashx endpoint to trusted IP addresses only
• Implement a Web Application Firewall with SQL injection protection rules for the affected endpoint
• Review and audit database permissions to minimize potential damage from successful exploitation
• Enable enhanced logging and monitoring for the affected system components

Patch Information

At the time of publication, no vendor patch information is available. Organizations should monitor the VulDB entry and vendor communications for patch availability. Review the project introduction for additional technical context while awaiting an official fix.

Workarounds

• Deploy input validation at the network perimeter using WAF rules to filter SQL injection attempts
• Implement network segmentation to isolate the management platform from untrusted networks
• Consider temporarily disabling the vulnerable endpoint if the functionality is not critical
• Apply the principle of least privilege to database accounts used by the application

# Example WAF rule to block suspicious DeviceIDS parameter values
# This should be adapted to your specific WAF platform
SecRule ARGS:DeviceIDS "@detectSQLi" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'SQL Injection attempt detected in DeviceIDS parameter'"