PHPGurukul Daily Expense Tracking System SQL Injection Vulnerability

A critical security flaw has been identified in PHPGurukul Daily Expense Tracking System version 1.1. This vulnerability resides in the /register.php file and is triggered by manipulating the email argument. Successful exploitation enables remote SQL injection, potentially granting attackers unauthorized access to sensitive database information or allowing them to modify data. This vulnerability, identified as CVE-2026-6193, has a CVSS v3.1 score of 7.3, indicating a high level of severity. The existence of a publicly available exploit increases the risk of widespread exploitation. Organizations using this software should take immediate action to mitigate the risk.

Attack Chain

1. An attacker identifies a vulnerable instance of PHPGurukul Daily Expense Tracking System 1.1.
2. The attacker crafts a malicious HTTP request targeting the /register.php endpoint.
3. Within the request, the attacker injects SQL code into the email parameter.
4. The application fails to properly sanitize the input, passing the malicious SQL query to the database.
5. The database executes the injected SQL code, potentially allowing the attacker to read, modify, or delete data.
6. The attacker may leverage the initial SQL injection to escalate privileges within the database.
7. The attacker could potentially gain access to administrative credentials stored in the database.
8. Finally, the attacker uses the compromised credentials to gain full control over the application.

Impact

Successful exploitation of this SQL injection vulnerability could lead to severe consequences. Attackers could gain unauthorized access to sensitive user data, including usernames, passwords, and financial information. This could result in identity theft, financial fraud, and reputational damage for both the organization and its users. The attacker could also modify or delete data, disrupt the application’s functionality, or even gain complete control of the server. Given the availability of a public exploit, the likelihood of attacks is significantly increased.

Recommendation

• Apply any available patches or updates provided by PHPGurukul to address CVE-2026-6193.
• Deploy the Sigma rule “Detect Suspicious SQL Injection Attempts in PHPGurukul Registration” to identify exploitation attempts targeting the /register.php endpoint.
• Implement input validation and sanitization measures on the email parameter in /register.php to prevent SQL injection.
• Monitor web server logs for suspicious activity, such as unusual characters or SQL syntax in the email parameter, which could indicate an attempted SQL injection (webserver log source).
• Implement a Web Application Firewall (WAF) rule to block requests containing SQL injection payloads targeting /register.php.