CVE-2025-26186
📋 TL;DR
This SQL injection vulnerability in openSIS v9.1 allows remote attackers to execute arbitrary SQL commands via the id parameter in Ajax.php. Attackers can potentially read, modify, or delete database content, and in some configurations execute arbitrary code. All openSIS v9.1 installations with the vulnerable Ajax.php endpoint are affected.
💻 Affected Systems
- openSIS Classic
📦 What is this software?
Opensis by Os4ed
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to data theft, data destruction, and remote code execution on the underlying server.
Likely Case
Database compromise allowing unauthorized access to sensitive student/administrator data, grade manipulation, or privilege escalation.
If Mitigated
Limited impact with proper input validation and database permissions, potentially only allowing data viewing without modification.
🎯 Exploit Status
The vulnerability is in a publicly accessible endpoint and SQL injection is a well-understood attack vector with many automated tools available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check GitHub pull request #330 for specific fix version
Vendor Advisory: https://github.com/OS4ED/openSIS-Classic/pull/330
Restart Required: No
Instructions:
1. Review the fix in GitHub pull request #330. 2. Apply the parameterized query fix to Ajax.php. 3. Test the application functionality. 4. No restart required as it's a PHP application.
🔧 Temporary Workarounds
Input Validation Filter
allAdd input validation to sanitize the id parameter before processing
Add input validation in Ajax.php: if(!is_numeric($_GET['id'])) { die('Invalid input'); }
WAF Rule
allImplement web application firewall rules to block SQL injection patterns
ModSecurity rule: SecRule ARGS:id "@detectSQLi" "id:1001,phase:2,deny,status:403"
🧯 If You Can't Patch
- Implement network segmentation to restrict access to the openSIS application
- Enable detailed logging and monitoring for SQL injection attempts on Ajax.php endpoint
🔍 How to Verify
Check if Vulnerable:
Test the Ajax.php endpoint with SQL injection payloads like: Ajax.php?id=1' OR '1'='1Check Version:
Check openSIS version in application configuration or admin panelVerify Fix Applied:
Verify that parameterized queries are implemented in Ajax.php and test with SQL injection payloads that should be rejected📡 Detection & Monitoring
Log Indicators:
- Unusual SQL errors in application logs
- Multiple requests to Ajax.php with suspicious id parameters
- Database query errors containing SQL syntax
Network Indicators:
- HTTP requests to Ajax.php with SQL keywords in parameters
- Unusual database connection patterns from web server
SIEM Query:
source="web_logs" AND url="*Ajax.php*" AND (param="*id=*'*" OR param="*id=*%27*")