CVE-2026-0547: PHPGurukul Online Course RCE Vulnerability

CVE-2026-0547 Overview

A vulnerability has been identified in PHPGurukul Online Course Registration up to version 3.1 that allows unrestricted file upload through the Student Registration Page. The vulnerability exists in the /admin/edit-student-profile.php file, where improper handling of the photo argument enables attackers to upload arbitrary files without proper validation. This type of vulnerability can potentially lead to remote code execution if malicious files such as PHP scripts are uploaded to the server.

Critical Impact
This unrestricted file upload vulnerability allows authenticated attackers to upload arbitrary files to the server, potentially enabling remote code execution or web shell deployment on affected PHPGurukul Online Course Registration installations.

Affected Products

PHPGurukul Online Course Registration version 3.1 and earlier
Systems running the vulnerable /admin/edit-student-profile.php component
Web servers hosting the Student Registration Page functionality

Discovery Timeline

2026-01-02 - CVE-2026-0547 published to NVD
2026-01-02 - Last updated in NVD database

Technical Details for CVE-2026-0547

Vulnerability Analysis

The vulnerability stems from improper access control (CWE-284) in the file upload functionality within the Student Registration Page component. When processing student profile photo uploads through /admin/edit-student-profile.php, the application fails to adequately validate the type, content, and extension of uploaded files. This improper access control allows attackers to bypass intended file type restrictions and upload potentially malicious content to the server.

The attack can be launched remotely over the network with low attack complexity. An attacker requires low privileges (authenticated user access) to exploit this vulnerability, but no user interaction is needed beyond the initial authentication. The vulnerability affects the confidentiality, integrity, and availability of the system to a limited extent.

Root Cause

The root cause of this vulnerability is the lack of proper input validation and access controls on the file upload mechanism in the photo parameter handling. The application does not implement sufficient server-side validation to verify that uploaded files are legitimate image files. This allows attackers to manipulate the photo argument to upload files with arbitrary extensions and content, bypassing any client-side restrictions that may be in place.

Attack Vector

The attack is network-based and can be executed remotely by an authenticated user. An attacker would need to authenticate to the application with at least low-level privileges, then navigate to the edit student profile functionality. By manipulating the file upload request for the photo parameter, the attacker can upload malicious files such as PHP web shells or other executable content.

The exploit for this vulnerability has been made public. Attackers could leverage this vulnerability to:

Upload web shells for persistent remote access
Execute arbitrary server-side code
Pivot to other systems on the network
Exfiltrate sensitive data from the application database

Technical details about this vulnerability can be found in the VulDB entry #339355 and the GitHub security documentation.

Detection Methods for CVE-2026-0547

Indicators of Compromise

Unusual file uploads in the profile photo upload directory with non-image extensions (e.g., .php, .phtml, .asp)
Web server logs showing POST requests to /admin/edit-student-profile.php with suspicious file names
Presence of unexpected executable files in the upload directories
Anomalous outbound network connections originating from the web server

Detection Strategies

Implement file integrity monitoring on upload directories to detect unauthorized file additions
Configure web application firewalls (WAF) to inspect and block suspicious file upload attempts
Monitor web server access logs for unusual patterns of requests to /admin/edit-student-profile.php
Deploy endpoint detection solutions to identify web shell activity or unauthorized code execution

Monitoring Recommendations

Enable detailed logging for all file upload operations in the application
Set up alerts for new files created in upload directories that do not match expected image file signatures
Monitor process execution on web servers for unexpected PHP or script interpreter processes
Implement regular security scanning of web-accessible directories for malicious content

How to Mitigate CVE-2026-0547

Immediate Actions Required

Restrict access to the /admin/edit-student-profile.php file and related administrative functions
Implement strict file type validation on the server side, checking both file extension and MIME type
Configure the upload directory to prevent execution of uploaded files
Review existing uploads for any malicious files that may have already been uploaded

Patch Information

At the time of publication, no official patch has been released by PHPGurukul for this vulnerability. Organizations using affected versions should check the PHPGurukul website for security updates. Additional vulnerability details are available in the VulDB submission #728988.

Workarounds

Implement a whitelist approach for allowed file extensions, permitting only image formats like .jpg, .jpeg, .png, and .gif
Validate uploaded files using server-side checks that verify file headers match expected image formats
Store uploaded files outside of the web root directory and serve them through a separate handler
Apply .htaccess rules or server configuration to disable script execution in upload directories

bash

# Apache configuration to prevent script execution in upload directory
<Directory "/path/to/uploads">
    php_admin_flag engine off
    AddHandler cgi-script .php .phtml .php3 .php4 .php5 .pl .py .jsp .asp .htm .shtml .sh .cgi
    Options -ExecCGI
</Directory>