CVE-2026-7389: EyouCMS SQL Injection Vulnerability

CVE-2026-7389 Overview

A SQL injection vulnerability has been identified in EyouCMS versions up to 1.7.9. The vulnerability exists in the GetSortData function located in the file application/common.php. An attacker can manipulate the sort_asc argument to inject malicious SQL statements, potentially compromising the underlying database. This attack can be initiated remotely without authentication, and the exploit has been publicly disclosed.

Critical Impact

Remote attackers can exploit this SQL injection flaw to read, modify, or delete sensitive database contents, potentially leading to full database compromise or unauthorized access to the CMS application.

Affected Products

• EyouCMS versions up to 1.7.9
• Installations using the GetSortData function in application/common.php

Discovery Timeline

• April 29, 2026 - CVE-2026-7389 published to NVD
• April 29, 2026 - Last updated in NVD database

Technical Details for CVE-2026-7389

Vulnerability Analysis

This vulnerability is classified as CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), which encompasses injection flaws including SQL injection. The GetSortData function in EyouCMS fails to properly sanitize user-supplied input passed through the sort_asc parameter before incorporating it into SQL queries.

The network-accessible nature of this vulnerability means that attackers can exploit it remotely without requiring any prior authentication or user interaction. When successfully exploited, this flaw can compromise the confidentiality, integrity, and availability of data stored in the CMS database.

The project maintainers were notified of this vulnerability through an issue report, but according to available information, they have not yet responded to the disclosure.

Root Cause

The root cause of this vulnerability is insufficient input validation and sanitization in the GetSortData function. The sort_asc parameter is incorporated into database queries without proper escaping or parameterization, allowing attackers to inject arbitrary SQL statements. This represents a classic SQL injection pattern where user-controlled input directly influences query construction.

Attack Vector

The attack can be performed remotely over the network. An attacker would craft a malicious request containing SQL injection payloads in the sort_asc parameter. When processed by the vulnerable GetSortData function in application/common.php, the injected SQL code would execute against the backend database with the privileges of the database user configured for the CMS.

The exploitation technique involves manipulating the sorting parameter to break out of the intended SQL context and execute attacker-controlled statements. This could enable data exfiltration, modification of existing records, or in some database configurations, command execution on the underlying system.

For detailed technical information about this vulnerability, refer to the Gitee Issue Report and the VulDB Vulnerability entry.

Detection Methods for CVE-2026-7389

Indicators of Compromise

• Unusual or malformed requests to endpoints utilizing the GetSortData function
• Database query logs showing SQL syntax errors or unexpected query structures involving the sort_asc parameter
• Web server access logs containing SQL injection patterns such as UNION SELECT, OR 1=1, or encoded SQL characters in request parameters
• Unexpected database modifications or data exfiltration attempts

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns targeting the sort_asc parameter
• Implement database activity monitoring to identify anomalous queries originating from the CMS application
• Configure intrusion detection systems (IDS) with signatures for common SQL injection attack payloads
• Review application logs for requests containing SQL metacharacters in the sort_asc parameter

Monitoring Recommendations

• Enable detailed logging for the application/common.php file and related database interactions
• Set up alerts for database errors that may indicate injection attempts
• Monitor for unusual data access patterns or bulk data retrieval from the database
• Implement rate limiting on endpoints that interact with the GetSortData function

How to Mitigate CVE-2026-7389

Immediate Actions Required

• Audit your EyouCMS installation to determine if version 1.7.9 or earlier is in use
• Implement input validation on the sort_asc parameter to allow only expected values (e.g., ASC or DESC)
• Deploy WAF rules to block SQL injection attempts targeting the vulnerable parameter
• Consider taking the affected functionality offline until a patch is available
• Review database logs for evidence of prior exploitation attempts

Patch Information

At the time of this publication, the EyouCMS project has not yet responded to the vulnerability disclosure. Users should monitor the official Gitee repository for updates regarding a security patch. Until an official fix is released, implementing the workarounds below is strongly recommended.

Workarounds

• Manually modify the GetSortData function in application/common.php to use parameterized queries or prepared statements
• Implement a whitelist validation that restricts sort_asc to only allow ASC or DESC values
• Use a reverse proxy or WAF to filter incoming requests and block known SQL injection patterns
• Restrict network access to the CMS administrative interfaces to trusted IP addresses only
• Consider using database user accounts with minimal privileges for the CMS connection

# Example: Restricting access via .htaccess (Apache)
# Add to your EyouCMS root .htaccess file
<IfModule mod_rewrite.c>
    RewriteEngine On
    # Block common SQL injection patterns in query strings
    RewriteCond %{QUERY_STRING} (union.*select|insert.*into|delete.*from|drop.*table) [NC]
    RewriteRule .* - [F,L]
</IfModule>