CVE-2025-11115: Simple Scheduling System SQLi Vulnerability

CVE-2025-11115 Overview

A SQL injection vulnerability has been discovered in code-projects Simple Scheduling System version 1.0. The vulnerability exists in the /addtime.php file, where improper handling of user-supplied input through the starttime and endtime parameters allows attackers to inject malicious SQL queries. This flaw enables remote attackers to manipulate database queries, potentially leading to unauthorized data access, modification, or deletion. The exploit has been publicly disclosed and may be actively used in attacks.

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

• September 28, 2025 - CVE-2025-11115 published to NVD
• October 23, 2025 - Last updated in NVD database

Technical Details for CVE-2025-11115

Vulnerability Analysis

This SQL injection vulnerability stems from insufficient input validation in the Simple Scheduling System's time management functionality. The /addtime.php endpoint accepts user-controlled parameters (starttime and endtime) that are directly incorporated into database queries without proper sanitization or parameterization. When users submit scheduling data, these time values are concatenated into SQL statements, creating an injection point that attackers can exploit to execute arbitrary SQL commands.

The network-accessible nature of this vulnerability means that any remote attacker with HTTP access to the application can attempt exploitation without requiring authentication. The injection allows attackers to read, modify, or delete data within the database scope accessible to the application's database user.

Root Cause

The root cause of CVE-2025-11115 is the failure to implement proper input sanitization and parameterized queries in the /addtime.php file. The application directly concatenates user-supplied starttime and endtime parameter values into SQL query strings, violating secure coding practices. This represents a classic CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component) vulnerability where untrusted input is not properly escaped before being used in database operations.

Attack Vector

The attack is conducted remotely over the network by sending specially crafted HTTP requests to the /addtime.php endpoint. An attacker can manipulate the starttime or endtime parameters to include SQL metacharacters and malicious query fragments. These injected payloads are then executed by the database server, allowing the attacker to:

• Extract sensitive information from database tables
• Bypass application authentication mechanisms
• Modify or delete database records
• Potentially escalate privileges or execute system commands depending on database configuration

The vulnerability requires no authentication or user interaction, making it trivially exploitable by remote attackers who can reach the application endpoint. Additional technical details are available in the GitHub CVE Issue Discussion and VulDB #326196.

Detection Methods for CVE-2025-11115

Indicators of Compromise

• Unusual or malformed HTTP requests to /addtime.php containing SQL keywords such as UNION, SELECT, INSERT, UPDATE, DELETE, or comment sequences (--, /**/)
• Database error messages appearing in application responses or logs indicating query syntax errors
• Unexpected database query patterns or high-volume requests to the scheduling endpoint
• Evidence of data exfiltration or unauthorized database modifications in audit logs

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in HTTP request parameters targeting /addtime.php
• Enable detailed logging for all requests to the /addtime.php endpoint and monitor for suspicious parameter values
• Implement database query monitoring to alert on anomalous query structures or unauthorized data access attempts
• Use SentinelOne Singularity to detect exploitation attempts and post-compromise activities on affected systems

Monitoring Recommendations

• Configure real-time alerting for SQL injection signature matches in web server and WAF logs
• Monitor database audit logs for queries originating from the web application that contain unusual syntax or access patterns
• Establish baseline behavior for the scheduling system and alert on deviations such as unexpected query volumes or access to sensitive tables
• Review application and database logs regularly for indicators of successful exploitation

How to Mitigate CVE-2025-11115

Immediate Actions Required

• Restrict network access to the affected Simple Scheduling System to trusted users and networks only
• Disable or remove the /addtime.php functionality if it is not critical to operations until a patch is available
• Deploy WAF rules to block SQL injection attempts targeting the starttime and endtime parameters
• Monitor the application closely for signs of exploitation attempts or compromise

Patch Information

No official vendor patch has been identified for CVE-2025-11115 at the time of publication. Organizations using Fabian Simple Scheduling System 1.0 should monitor the Code Projects Security Resource for security updates. Given the public disclosure of this exploit and the lack of available patches, consider replacing the affected application with a more actively maintained scheduling solution.

Workarounds

• Implement input validation at the application layer to reject starttime and endtime values containing SQL metacharacters
• Use a reverse proxy or WAF to filter malicious input before it reaches the application
• Restrict database user privileges to the minimum required, limiting the impact of successful SQL injection
• If source code access is available, refactor the vulnerable code in /addtime.php to use parameterized queries or prepared statements

# Example WAF rule to block SQL injection in scheduling parameters
# ModSecurity rule example
SecRule ARGS:starttime|ARGS:endtime "@detectSQLi" \
    "id:100001,phase:2,deny,status:403,msg:'SQL Injection attempt blocked in scheduling parameters'"