PHPGurukul Online Course Registration 3.1 SQL Injection Vulnerability

A critical SQL injection vulnerability has been identified in PHPGurukul Online Course Registration version 3.1. This vulnerability, assigned CVE-2026-5814, resides within the /admin/check_availability.php file. An attacker can remotely exploit this vulnerability by injecting malicious SQL code into the regno parameter. The vulnerability was publicly disclosed and an exploit is available, increasing the risk of active exploitation. Successful exploitation allows attackers to potentially read, modify, or delete sensitive data within the application's database, leading to data breaches, account compromise, and complete system takeover. Organizations using the affected version of PHPGurukul Online Course Registration should take immediate action to mitigate this risk.

Attack Chain

1. An attacker identifies a vulnerable PHPGurukul Online Course Registration 3.1 instance accessible over the internet.
2. The attacker crafts a malicious HTTP request targeting the /admin/check_availability.php file.
3. The attacker injects SQL code into the regno parameter within the HTTP GET or POST request. For example, regno=1' OR '1'='1.
4. The web server processes the request and passes the injected SQL code to the database server without proper sanitization.
5. The database server executes the malicious SQL query, potentially granting the attacker unauthorized access to sensitive data.
6. The attacker retrieves sensitive information such as user credentials, course data, or administrative details from the database.
7. The attacker uses the stolen credentials to gain administrative access to the application.
8. The attacker may further compromise the system by uploading malicious files, modifying application settings, or disrupting service availability.

Impact

Successful exploitation of this SQL injection vulnerability can have severe consequences. Attackers could gain unauthorized access to sensitive student and course data, leading to privacy breaches and potential identity theft. They could also manipulate course registration records, alter grades, or disrupt the entire online learning platform. The affected software is used for online course registration, potentially impacting educational institutions and training providers. A successful attack could result in reputational damage, financial losses, and legal liabilities. Given that an exploit is publicly available, the risk of widespread exploitation is high.

Recommendation

• Apply the security patch or upgrade to a version of PHPGurukul Online Course Registration that addresses CVE-2026-5814 (if available from the vendor).
• Implement input validation and sanitization measures to prevent SQL injection attacks. Specifically, sanitize the regno parameter in /admin/check_availability.php.
• Deploy a Web Application Firewall (WAF) with rules to detect and block SQL injection attempts targeting the /admin/check_availability.php endpoint.
• Monitor web server logs for suspicious requests containing SQL injection payloads, focusing on requests to /admin/check_availability.php (webserver log source).
• Implement database activity monitoring to detect unauthorized access or modifications to the database.
• Deploy the provided Sigma rule to detect potential SQL injection attempts in web server logs.