CVE-2026-5634 Overview
A SQL injection vulnerability was identified in projectworlds Car Rental Project version 1.0. This vulnerability affects unknown functionality within the /book_car.php file of the Parameter Handler component. By manipulating the fname argument, an attacker can inject malicious SQL queries. The attack can be initiated remotely, and a public exploit is reportedly available.
Critical Impact
Remote attackers can exploit this SQL injection vulnerability to manipulate database queries, potentially leading to unauthorized data access, data modification, or complete database compromise without authentication.
Affected Products
- projectworlds Car Rental Project 1.0
- /book_car.php Parameter Handler component
Discovery Timeline
- April 6, 2026 - CVE-2026-5634 published to NVD
- April 7, 2026 - Last updated in NVD database
Technical Details for CVE-2026-5634
Vulnerability Analysis
This vulnerability represents a classic SQL injection flaw (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) in a web application's booking functionality. The vulnerable endpoint /book_car.php fails to properly sanitize user-supplied input in the fname parameter before incorporating it into SQL queries.
The vulnerability is network-accessible, requiring no authentication or user interaction to exploit. When successfully exploited, attackers can read, modify, or delete data from the backend database, depending on the database permissions and application architecture. The publicly available exploit increases the risk of widespread attacks against vulnerable installations.
Root Cause
The root cause of this vulnerability lies in insufficient input validation and lack of parameterized queries in the application's PHP code. The fname parameter in the /book_car.php file is directly concatenated into SQL statements without proper sanitization or the use of prepared statements. This coding practice allows attackers to break out of the intended SQL query context and inject arbitrary SQL commands.
Attack Vector
The attack vector for this vulnerability is network-based, allowing remote exploitation. An attacker can craft malicious HTTP requests to the /book_car.php endpoint with specially crafted payloads in the fname parameter. Since no authentication is required and the attack complexity is low, any remote attacker with network access to the vulnerable application can attempt exploitation.
The attacker would typically submit form data or craft direct requests containing SQL metacharacters (such as single quotes, double dashes, or UNION statements) within the fname field to manipulate the backend database queries. This could enable data extraction, authentication bypass, or database manipulation depending on the underlying database configuration and user privileges.
Detection Methods for CVE-2026-5634
Indicators of Compromise
- HTTP requests to /book_car.php containing SQL injection patterns in the fname parameter (e.g., single quotes, UNION SELECT statements, comment sequences)
- Database error messages or unusual query patterns in application logs
- Unexpected database queries or data access patterns originating from the web application
- Web application firewall (WAF) alerts for SQL injection attempts targeting the booking functionality
Detection Strategies
- Deploy web application firewall rules to detect and block SQL injection patterns in requests to /book_car.php
- Implement application logging to capture all requests containing special characters in form parameters
- Monitor database query logs for anomalous queries originating from the Car Rental application
- Use intrusion detection systems (IDS) with signatures for common SQL injection payloads
Monitoring Recommendations
- Review access logs for suspicious requests targeting /book_car.php with encoded or malformed fname values
- Set up alerts for failed or unusual database authentication attempts from the web application
- Monitor for mass data exfiltration patterns that may indicate successful SQL injection exploitation
- Enable verbose error logging while ensuring error details are not exposed to end users
How to Mitigate CVE-2026-5634
Immediate Actions Required
- Remove or restrict access to the vulnerable /book_car.php file until a patch is applied
- Implement input validation on all user-supplied parameters, especially the fname field
- Deploy a web application firewall (WAF) to filter SQL injection attempts
- Review and audit all database accounts used by the application to apply least-privilege principles
Patch Information
No official patch information is currently available from the vendor. Organizations using projectworlds Car Rental Project 1.0 should monitor the GitHub vulnerability report and VulDB entry for updates. In the absence of an official fix, implementing the workarounds below is strongly recommended.
Workarounds
- Modify the application code to use parameterized queries or prepared statements for all database interactions involving the fname parameter
- Implement server-side input validation to reject or sanitize special characters in the fname field before processing
- Deploy network-level access controls to restrict access to the vulnerable endpoint from untrusted networks
- Consider taking the booking functionality offline until the vulnerability is properly remediated
# Example: Apache mod_rewrite rule to block access to vulnerable endpoint
# Add to .htaccess or Apache configuration
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/book_car\.php$ [NC]
RewriteRule .* - [F,L]
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
