CVE-2026-6978: JiZhiCMS SQL Injection Vulnerability

CVE-2026-6978 Overview

A SQL injection vulnerability has been identified in JiZhiCMS versions up to and including 2.5.6. The vulnerability exists in the htmlspecialchars_decode function within the file /index.php/admins/Sys/addcache.html. An attacker can manipulate the sqls parameter to inject malicious SQL queries, potentially leading to unauthorized data access, data modification, or database compromise. The attack can be launched remotely, and a public exploit is now available. The vendor was contacted about this disclosure but did not respond.

Critical Impact

Authenticated attackers with administrative privileges can exploit this SQL injection vulnerability to execute arbitrary SQL commands against the backend database, potentially exposing sensitive data or compromising database integrity.

Affected Products

• JiZhiCMS versions up to 2.5.6
• JiZhiCMS /index.php/admins/Sys/addcache.html endpoint
• Systems running vulnerable JiZhiCMS installations with exposed administrative interfaces

Discovery Timeline

• 2026-04-25 - CVE-2026-6978 published to NVD
• 2026-04-29 - Last updated in NVD database

Technical Details for CVE-2026-6978

Vulnerability Analysis

This vulnerability falls under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), commonly known as injection. The flaw resides in how the application processes user-supplied input through the sqls parameter in the administrative cache management functionality.

The vulnerable endpoint /index.php/admins/Sys/addcache.html utilizes the htmlspecialchars_decode function which reverses HTML entity encoding. When the sqls parameter is processed through this function without adequate SQL input sanitization, it allows attackers to craft payloads that bypass typical input filters. The decoded malicious input is then directly incorporated into SQL queries executed against the database.

While the vulnerability requires high-level privileges (administrative access) to exploit, the network-accessible nature of the attack vector means that compromised admin credentials or other privilege escalation paths could enable remote attackers to leverage this flaw.

Root Cause

The root cause of this vulnerability is insufficient input validation and sanitization of the sqls parameter before it is used in database operations. The application relies on htmlspecialchars_decode which converts HTML entities back to their original characters, effectively undoing any protective encoding that might have been applied. Without subsequent parameterized query handling or proper escaping, the decoded input flows directly into SQL statements, creating an injection point.

Attack Vector

The attack is executed remotely via the network by sending a crafted HTTP request to the vulnerable administrative endpoint. An authenticated attacker with administrative privileges submits a malicious payload through the sqls parameter. The payload, potentially containing HTML-encoded SQL injection sequences, is decoded by htmlspecialchars_decode and processed by the database engine.

The exploitation flow involves: (1) gaining or possessing administrative access to the JiZhiCMS instance, (2) crafting a request to /index.php/admins/Sys/addcache.html with SQL injection payloads in the sqls parameter, and (3) the server processing the request, decoding the input, and executing the injected SQL against the database.

For detailed technical information about this vulnerability, refer to the GitHub Issue Discussion and VulDB entry #359521.

Detection Methods for CVE-2026-6978

Indicators of Compromise

• Unusual HTTP POST requests to /index.php/admins/Sys/addcache.html containing SQL keywords or special characters in the sqls parameter
• Database logs showing unexpected queries, UNION SELECT statements, or attempts to access system tables
• Administrative session activity from unfamiliar IP addresses or at unusual times
• Evidence of data exfiltration or unexpected database modifications

Detection Strategies

• Implement web application firewall (WAF) rules to detect SQL injection patterns targeting the /admins/Sys/addcache.html endpoint
• Monitor HTTP request logs for suspicious payloads containing SQL syntax (SELECT, UNION, INSERT, DROP, etc.) in the sqls parameter
• Configure database activity monitoring to alert on unusual query patterns or access to sensitive tables
• Deploy endpoint detection solutions to identify post-exploitation activity following successful database compromise

Monitoring Recommendations

• Enable detailed logging for all administrative interface access in JiZhiCMS
• Set up alerts for multiple failed or anomalous requests to the vulnerable endpoint
• Monitor database query logs for injection artifacts and unexpected command execution
• Review administrative user account activity regularly for signs of credential compromise

How to Mitigate CVE-2026-6978

Immediate Actions Required

• Restrict network access to the JiZhiCMS administrative interface to trusted IP addresses only
• Implement strong authentication mechanisms and monitor administrative account usage
• Consider temporarily disabling the cache management functionality if not critical to operations
• Deploy web application firewall rules to block SQL injection attempts targeting the vulnerable endpoint

Patch Information

No official patch has been released by the vendor. The vendor was contacted about this disclosure but did not respond. Organizations using JiZhiCMS should monitor for future security updates and consider the workarounds listed below. For additional context, see the VulDB submission #795348.

Workarounds

• Restrict access to /index.php/admins/Sys/addcache.html using server-level access controls (IP whitelisting via .htaccess or nginx configuration)
• Implement input validation at the application or reverse proxy level to filter SQL injection patterns from the sqls parameter
• Consider disabling or removing the affected cache management functionality until a patch is available
• Apply network segmentation to isolate the JiZhiCMS administrative interface from untrusted networks

# Example nginx configuration to restrict admin access
location ~ ^/index\.php/admins/ {
    allow 192.168.1.0/24;  # Trusted internal network
    allow 10.0.0.5;        # Admin workstation IP
    deny all;
    
    # Additional WAF-style protection
    if ($args ~* "(union|select|insert|delete|drop|update|;)" ) {
        return 403;
    }
}