Executive Intelligence Brief

A SQL injection vulnerability has been discovered in SourceCodester Class and Exam Timetabling System 1.0. The vulnerability is highly severe with a CVSS score of 7.3 and can be exploited remotely. The affected file is /preview7.php, and the vulnerable argument is course_year_section. Although not actively exploited, the exploit has been publicly released, increasing the risk of attacks. Immediate patching or mitigation is recommended.

Threat Overview

The SourceCodester Class and Exam Timetabling System is a web-based application designed to manage class and exam schedules. It is widely used in educational institutions for organizing timetables. The system has a known vulnerability, tracked as CVE-2026-13488, which affects version 1.0 of the software. This vulnerability is particularly concerning because it allows for SQL injection attacks, which can lead to unauthorized access, data breaches, and other malicious activities.

Technical Deep Dive

Vulnerability Classification

The vulnerability is classified as a SQL injection (SQLi) vulnerability, which falls under CWE-89. SQL injection occurs when an attacker is able to inject malicious SQL code into a web application's database in order to extract or modify sensitive data. In this case, the vulnerability is caused by the lack of proper input validation and sanitization of the course_year_section argument in the /preview7.php file.

Root Cause Analysis

The root cause of this vulnerability is the failure to properly validate and sanitize user input. The course_year_section argument is not checked for malicious SQL code, allowing an attacker to inject arbitrary SQL commands. This can lead to unauthorized access to sensitive data, modification of database contents, and potentially even execution of system-level commands.

Attack Vector & Chain

The attack vector for this vulnerability is remote, meaning that an attacker can exploit it without needing physical access to the system. The attack requires no authentication or user interaction, making it particularly dangerous. The vulnerability can be exploited by sending a crafted request to the /preview7.php file with malicious SQL code in the course_year_section argument.

Exploitation Scenario Walkthrough

Scenario: SQL Injection Attack on Class and Exam Timetabling System

Reconnaissance: An attacker uses a vulnerability scanner or manually searches for vulnerable instances of the SourceCodester Class and Exam Timetabling System 1.0.

Weaponization: The attacker crafts a malicious SQL injection payload to be injected into the course_year_section argument of the /preview7.php file.

Delivery & Exploitation: The attacker sends a request to the /preview7.php file with the malicious payload in the course_year_section argument. The server processes the request without proper validation, allowing the SQL injection to occur.

Post-Exploitation: The attacker can extract sensitive data, modify database contents, or execute system-level commands depending on the privileges of the database user.

Impact Realization: The attacker achieves unauthorized access to sensitive data or takes control of the database, potentially leading to data breaches, system compromise, or other malicious activities.

Exploitation in the Wild

Although the vulnerability is not currently being actively exploited, the exploit has been released to the public. This increases the likelihood of future attacks, as malicious actors can easily access and use the exploit.

Impact Analysis

Direct Impact

The direct impact of this vulnerability is the potential for SQL injection attacks, which can lead to unauthorized access to sensitive data, modification of database contents, and potentially even execution of system-level commands. The CVSS score of 7.3 indicates a high severity.

Downstream & Cascading Effects

The downstream effects of this vulnerability can include data breaches, system compromise, and potentially even lateral movement within a network. If the database user has elevated privileges, an attacker could potentially escalate privileges and gain control of the system.

Affected Products & Versions

The affected product is SourceCodester Class and Exam Timetabling System version 1.0. Specifically, the /preview7.php file is vulnerable to SQL injection attacks.

Detection & Threat Hunting

Indicators of Compromise

Indicators of compromise (IoCs) for this vulnerability may include:

  • Unusual database queries or errors
  • Unauthorized access to sensitive data
  • Modification of database contents
  • Execution of system-level commands

Detection Rules & Signatures

Detection rules for this vulnerability may include:

  • Monitoring for unusual database activity
  • Detection of SQL injection payloads
  • Identification of unauthorized access to sensitive data

Threat Hunting Queries

Threat hunting queries for this vulnerability may include:

  • Searching for instances of the /preview7.php file being accessed with suspicious parameters
  • Monitoring for database queries that match known SQL injection payloads

Remediation & Hardening

Immediate Actions (0-24 hours)

Immediate actions to remediate this vulnerability include:

  • Patching or upgrading to a fixed version of the SourceCodester Class and Exam Timetabling System
  • Implementing input validation and sanitization for the course_year_section argument
  • Monitoring for suspicious activity and potential exploitation

Short-Term Hardening (1-7 days)

Short-term hardening measures may include:

  • Implementing a web application firewall (WAF) to detect and prevent SQL injection attacks
  • Enhancing monitoring and logging to detect potential exploitation
  • Restricting access to the /preview7.php file

Strategic Recommendations

Strategic recommendations for preventing similar vulnerabilities in the future include:

  • Implementing secure coding practices, such as input validation and sanitization
  • Conducting regular security testing and vulnerability assessments
  • Keeping software and systems up to date with the latest security patches

Analyst Assessment

The risk of this vulnerability is high due to its severity and the fact that the exploit has been publicly released. Organizations using the SourceCodester Class and Exam Timetabling System 1.0 should prioritize patching or mitigating this vulnerability as soon as possible to prevent potential exploitation.

Sources

  • National Vulnerability Database (NVD) - CVE-2026-13488