CVE-2023-26781
📋 TL;DR
CVE-2023-26781 is a critical SQL injection vulnerability in mccms 2.6 that allows remote attackers to execute arbitrary SQL commands through the Author Center's Reader Comments Search feature. This affects all users running mccms 2.6, potentially compromising the entire database and application. Attackers can steal, modify, or delete data, and potentially gain full control of the affected system.
💻 Affected Systems
- mccms
📦 What is this software?
Mccms by Chshcms
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data destruction, privilege escalation to administrative access, and potential remote code execution on the underlying server.
Likely Case
Unauthorized data extraction (user credentials, sensitive content), database manipulation, and potential authentication bypass.
If Mitigated
Limited impact with proper input validation, parameterized queries, and web application firewall rules blocking SQL injection patterns.
🎯 Exploit Status
Exploitation requires access to Author Center. SQL injection is well-understood with many automated tools available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check GitHub repository for latest version
Vendor Advisory: https://github.com/chshcms/mccms/issues/1
Restart Required: No
Instructions:
1. Backup database and application files. 2. Update to latest mccms version from official repository. 3. Replace vulnerable files with patched versions. 4. Test functionality after update.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation and parameterized queries for the Reader Comments Search functionality.
WAF Rule Implementation
allDeploy web application firewall rules to block SQL injection patterns targeting the vulnerable endpoint.
🧯 If You Can't Patch
- Disable the Author Center -> Reader Comments -> Search functionality entirely
- Implement network segmentation and restrict access to the mccms application to trusted IPs only
🔍 How to Verify
Check if Vulnerable:
Test the Author Center -> Reader Comments -> Search feature with SQL injection payloads like ' OR '1'='1Check Version:
Check mccms version in configuration files or admin panelVerify Fix Applied:
Test with same SQL injection payloads after patch - should return error or no data instead of executing SQL📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in application logs
- Multiple failed login attempts followed by SQL-like strings in search parameters
- Database error messages containing SQL syntax
Network Indicators:
- HTTP requests to /author/reader_comments with SQL keywords in parameters
- Unusual database connection patterns from web server
SIEM Query:
source="web_logs" AND (uri_path="/author/reader_comments" AND (param="search" CONTAINS "UNION" OR param="search" CONTAINS "SELECT" OR param="search" CONTAINS "OR '1'='1"))