CVE-2025-11105: Simple Scheduling System SQLi Vulnerability

CVE-2025-11105 Overview

A SQL injection vulnerability has been identified in Fabian Simple Scheduling System version 1.0. The flaw exists in the /schedulingsystem/addsubject.php file, where improper handling of the subcode parameter allows attackers to inject malicious SQL statements. This vulnerability can be exploited remotely without authentication, potentially leading to unauthorized data access, data manipulation, or complete database compromise.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to bypass authentication, extract sensitive data from the database, modify or delete records, and potentially gain further access to the underlying system.

Affected Products

• Fabian Simple Scheduling System 1.0

Discovery Timeline

• 2025-09-28 - CVE-2025-11105 published to NVD
• 2025-10-23 - Last updated in NVD database

Technical Details for CVE-2025-11105

Vulnerability Analysis

This vulnerability is classified as an injection flaw (CWE-74), specifically SQL injection. The affected component /schedulingsystem/addsubject.php fails to properly sanitize user input in the subcode parameter before incorporating it into SQL queries. This allows an attacker to manipulate database queries by injecting specially crafted SQL statements through the vulnerable parameter.

The vulnerability is exploitable over the network without requiring authentication or user interaction, making it accessible to remote attackers. Successful exploitation can result in unauthorized read and write access to database contents, potentially compromising the confidentiality and integrity of stored information.

Root Cause

The root cause of this vulnerability is insufficient input validation and the lack of parameterized queries in the addsubject.php file. When user-supplied data from the subcode parameter is directly concatenated into SQL queries without proper sanitization or prepared statements, it creates an injection point that attackers can leverage to execute arbitrary SQL commands.

Attack Vector

The attack vector is network-based, requiring no special privileges or user interaction. An attacker can craft malicious HTTP requests to the /schedulingsystem/addsubject.php endpoint, injecting SQL payloads through the subcode parameter. The vulnerability has been publicly disclosed and exploit details have been published, increasing the risk of exploitation in the wild.

The technical details and proof-of-concept information can be found in the GitHub CVE Issue #2 and VulDB #326186.

Detection Methods for CVE-2025-11105

Indicators of Compromise

• HTTP requests to /schedulingsystem/addsubject.php containing SQL syntax such as single quotes, UNION statements, or comment sequences in the subcode parameter
• Unusual database queries or errors in application logs indicating SQL injection attempts
• Unexpected database modifications or unauthorized data access patterns
• Web server logs showing repeated requests to the vulnerable endpoint with varying parameter values

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns targeting the subcode parameter
• Implement database activity monitoring to identify anomalous query patterns or unauthorized data access
• Configure intrusion detection systems (IDS) with signatures for SQL injection attack patterns
• Enable detailed logging on the web application and database servers to capture suspicious activity

Monitoring Recommendations

• Monitor HTTP traffic to /schedulingsystem/addsubject.php for suspicious input patterns
• Set up alerts for database errors that may indicate injection attempts
• Regularly review access logs for patterns consistent with automated vulnerability scanning or exploitation attempts

How to Mitigate CVE-2025-11105

Immediate Actions Required

• Remove or disable the Simple Scheduling System if not critical to operations until a patch is available
• Implement input validation on the subcode parameter to reject malicious input
• Deploy WAF rules to block SQL injection attempts targeting the vulnerable endpoint
• Restrict network access to the application to trusted IP addresses only

Patch Information

At the time of this writing, no official vendor patch has been released for this vulnerability. Organizations using Fabian Simple Scheduling System 1.0 should monitor the Code Projects Resource Hub for security updates and consider the workarounds listed below to reduce risk.

Workarounds

• Implement prepared statements or parameterized queries in the addsubject.php file to prevent SQL injection
• Apply input validation and sanitization to the subcode parameter, allowing only expected characters
• Use a WAF to filter malicious requests before they reach the application
• Consider migrating to a more actively maintained scheduling solution with better security practices

If you have access to the source code, the vulnerable parameter handling should be updated to use parameterized queries. Consult the OWASP SQL Injection Prevention Cheat Sheet for implementation guidance on securing database queries.