CVE-2026-7107: Invoice System Laravel RCE Vulnerability

CVE-2026-7107 Overview

A vulnerability has been identified in code-projects Invoice System in Laravel 1.0 that allows unrestricted file upload through the /company endpoint. The vulnerability exists in an unknown function that processes the logo argument, enabling attackers to upload arbitrary files without proper validation. This attack can be carried out remotely by authenticated users, and a public exploit has been made available.

Critical Impact

Unrestricted file upload vulnerabilities can lead to remote code execution if attackers upload malicious scripts (such as PHP web shells) that are subsequently executed by the web server.

Affected Products

• code-projects Invoice System in Laravel 1.0

Discovery Timeline

• 2026-04-27 - CVE CVE-2026-7107 published to NVD
• 2026-04-29 - Last updated in NVD database

Technical Details for CVE-2026-7107

Vulnerability Analysis

This vulnerability is classified as an improper access control issue (CWE-284) that manifests as an unrestricted file upload condition. The /company endpoint in the Invoice System application accepts file uploads for a company logo without implementing adequate validation controls. When an authenticated user submits a request to this endpoint with a manipulated logo argument, the application fails to properly restrict the types of files that can be uploaded.

The lack of file type validation, extension checking, or content verification means attackers can potentially upload executable files such as PHP scripts. If these files are stored in a web-accessible directory and the server is configured to execute them, this creates a direct path to remote code execution.

Root Cause

The root cause of this vulnerability is improper input validation and missing access controls on the file upload functionality within the /company endpoint. The application does not implement sufficient checks to:

• Validate the MIME type of uploaded files
• Restrict allowed file extensions to safe image formats
• Verify file content matches expected image data
• Store uploads outside of web-accessible directories

Attack Vector

The attack is network-based and requires low-privilege authentication to the application. An attacker with valid credentials can exploit this vulnerability by:

1. Authenticating to the Invoice System application
2. Navigating to the company settings or profile page
3. Intercepting the logo upload request
4. Modifying the request to include malicious file content with an executable extension
5. Submitting the manipulated request to the /company endpoint

A proof-of-concept exploit has been publicly documented. For technical details, refer to the GitHub Gist PoC Code or the VulDB Vulnerability #359708 entry.

Detection Methods for CVE-2026-7107

Indicators of Compromise

• Unusual file types (.php, .phtml, .asp, .aspx, .jsp) uploaded to the company logo directory
• Web shells or backdoor files present in upload directories
• Unexpected outbound network connections from the web server process
• Authentication logs showing access to /company endpoint followed by suspicious activity

Detection Strategies

• Implement file integrity monitoring on web-accessible upload directories to detect unauthorized file additions
• Monitor HTTP requests to the /company endpoint for suspicious file extensions or content types in the logo parameter
• Deploy web application firewall (WAF) rules to block requests containing executable file signatures in upload parameters
• Analyze web server logs for POST requests to /company with anomalous payload sizes or content

Monitoring Recommendations

• Enable detailed logging for all file upload operations within the Laravel application
• Configure alerts for any executable file creation events in the application's storage directories
• Monitor for PHP process spawning unexpected child processes or making network connections
• Implement real-time log analysis to correlate authentication events with file upload activities

How to Mitigate CVE-2026-7107

Immediate Actions Required

• Restrict access to the /company endpoint to only trusted administrative users
• Implement server-side file type validation that checks both MIME type and file content (magic bytes)
• Configure file upload storage to a non-web-accessible directory
• Disable script execution in upload directories via web server configuration

Patch Information

No official vendor patch has been identified for this vulnerability. The application is maintained by code-projects, and users should monitor the Code Projects Resource Hub for updates. Given the severity of unrestricted file upload vulnerabilities, organizations should implement the workarounds below until a patch becomes available.

Workarounds

• Add server-side validation to whitelist only image file extensions (.jpg, .jpeg, .png, .gif) for the logo upload
• Implement content-type verification by checking file magic bytes to ensure uploaded files are genuine images
• Store uploaded files outside of the web root with randomized filenames and serve them through a controller that sets appropriate headers
• Add .htaccess rules (Apache) or equivalent nginx configuration to prevent script execution in upload directories

# Apache - Disable PHP execution in upload directory
# Add to .htaccess in the uploads folder
php_flag engine off
<FilesMatch "\.(php|phtml|php3|php4|php5|php7|phps)$">
    Require all denied
</FilesMatch>

# Nginx - Disable PHP execution in upload directory
# Add to server block configuration
location ~* /uploads/.*\.(php|phtml|php3|php4|php5|php7|phps)$ {
    deny all;
}