Remote SQL Injection Vulnerability in SourceCodester Class and Exam Timetabling System (CVE-2026-16484)

A high-severity remote SQL injection vulnerability, identified as CVE-2026-16484, has been discovered in SourceCodester Class and Exam Timetabling System version 1.0. This flaw specifically impacts an unspecified functionality within the /edit_subjecta.php file, where the application improperly handles the 'ID' argument, allowing for the injection of malicious SQL commands. The vulnerability can be exploited by an unauthenticated attacker remotely, meaning no prior access or credentials are required. Crucially, a public exploit for this vulnerability has been published, significantly increasing the likelihood of widespread exploitation by various threat actors. Successful exploitation can lead to unauthorized access to sensitive database information, data modification, or potentially complete database compromise, jeopardizing the integrity and confidentiality of academic scheduling data.

Attack Chain

1. An unauthenticated attacker crafts a malicious HTTP GET or POST request targeting the /edit_subjecta.php endpoint of the vulnerable SourceCodester Class and Exam Timetabling System 1.0.
2. The request includes specially crafted SQL syntax injected into the 'ID' parameter.
3. The web application, failing to properly sanitize or validate the 'ID' argument, processes the malicious input.
4. The injected SQL commands are executed by the backend database as part of a legitimate query.
5. The attacker observes the database's response, which might include error messages, delayed responses, or directly returned data, confirming the success of the injection.
6. Through further iterative requests, the attacker can extract sensitive information, modify existing database records, or potentially achieve administrative access within the application.
7. The attacker's ultimate objective may include data exfiltration, defacement, or further lateral movement within the compromised environment.

Impact

The successful exploitation of CVE-2026-16484 in SourceCodester Class and Exam Timetabling System 1.0 poses a significant risk to data confidentiality and integrity. Attackers can gain unauthorized access to sensitive information stored in the database, which may include student data, exam schedules, faculty details, and other confidential academic records. Data manipulation could lead to falsified grades, altered schedules, or system disruption, severely impacting educational operations. With a public exploit available, the vulnerability is highly susceptible to opportunistic attacks, potentially affecting any organization using this specific software version and leading to reputational damage, operational downtime, and compliance penalties.

Recommendation

• Patch the SourceCodester Class and Exam Timetabling System 1.0 immediately to address CVE-2026-16484, as official updates become available.
• Deploy the Sigma rule "Detects CVE-2026-16484 Exploitation - SQL Injection in edit_subjecta.php" to your SIEM solution to identify and alert on attempted exploitation.
• Implement and configure a Web Application Firewall (WAF) to detect and block SQL injection payloads targeting your web applications.
• Monitor web server access logs for suspicious requests to /edit_subjecta.php containing SQL injection patterns and unusual query parameters.