Executive Summary

CVE-2026-7238 is an arbitrary file upload vulnerability found in the AdminUpdateAlbum.php file of the Online Music Site 1.0 by Code-projects. The vulnerability occurs because the application only checks the HTTP headers Content-Type and Content-Disposition to validate uploaded files, which attackers can easily manipulate.

An attacker can craft a multipart/form-data POST request with manipulated headers and upload a malicious file disguised as an image, such as a PHP webshell. This allows the attacker to execute arbitrary code on the server remotely without authentication.

The exploit involves uploading a file with PHP code embedded but named and labeled as an image, bypassing the weak validation. Once uploaded, the attacker can access and control the server through the uploaded webshell.

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Impact Analysis

This vulnerability allows remote attackers to upload and execute malicious scripts on the server without authentication, leading to remote code execution.

• Attackers can gain full control over the affected server.
• Sensitive data stored on the server can be stolen or manipulated.
• The server can be used as a launchpad for further attacks against other systems.
• System integrity, confidentiality, and availability are at risk.

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Detection Guidance

This vulnerability can be detected by monitoring for suspicious HTTP POST requests to the endpoint /mis/Administrator/PHP/AdminUpdateAlbum.php that include multipart/form-data uploads with manipulated Content-Type and Content-Disposition headers.

Specifically, look for uploads where the file extension or Content-Type does not match the actual file content, such as PHP code disguised as image files.

Example commands to detect such activity include using network traffic analysis tools like tcpdump or Wireshark to capture HTTP POST requests to the vulnerable endpoint, and grep or similar tools to search for suspicious file names or headers in web server logs.

• Use tcpdump to capture HTTP POST requests to the vulnerable path: tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep 'POST /mis/Administrator/PHP/AdminUpdateAlbum.php'
• Search web server access logs for suspicious file uploads: grep 'AdminUpdateAlbum.php' /var/log/apache2/access.log | grep -E '\.php|Content-Type: image/gif|Content-Disposition'
• Check uploaded files directory for unexpected file extensions or recently modified files with suspicious names like *.php or files with double extensions (e.g., .php.png).

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Mitigation Strategies

Immediate mitigation steps include:

• Do not rely solely on the Content-Type header for file validation; instead, verify the actual file content by inspecting file headers or magic numbers.
• Implement a strict whitelist of allowed file extensions (e.g., jpg, png, pdf) and reject files with script-related suffixes such as .php, .asp, or bypass suffixes like .php.png.
• Store uploaded files outside the web root or in directories that are not directly accessible via URL, and access them through backend programs.
• Rename uploaded files using random strings combined with fixed suffixes to prevent attackers from guessing file locations and executing malicious files.
• Monitor and restrict access to the vulnerable endpoint and consider applying web application firewall (WAF) rules to block suspicious upload attempts.

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Compliance Impact

The vulnerability allows remote attackers to upload and execute malicious scripts on the server, potentially leading to unauthorized access, data theft, and system compromise.

Such unauthorized access and potential data breaches can negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive data.

Therefore, if exploited, this vulnerability could lead to non-compliance with data protection requirements, resulting in legal and financial consequences.

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