CVE-2025-15406: Phpgurukul Course Registration Auth Bypass

CVE-2025-15406 Overview

A broken access control vulnerability has been discovered in PHPGurukul Online Course Registration up to version 3.1. This security flaw affects an unspecified function within the application and results in missing authorization checks. The vulnerability allows remote attackers to bypass intended access restrictions, potentially gaining unauthorized access to sensitive functionality or data. An exploit has been published and may be used by malicious actors.

Critical Impact

Remote attackers can exploit this missing authorization vulnerability to bypass access controls in PHPGurukul Online Course Registration, potentially accessing restricted functionality without proper authentication or permissions.

Affected Products

• PHPGurukul Online Course Registration versions up to 3.1
• All installations using the vulnerable codebase without proper authorization controls

Discovery Timeline

• 2026-01-01 - CVE-2025-15406 published to NVD
• 2026-01-06 - Last updated in NVD database

Technical Details for CVE-2025-15406

Vulnerability Analysis

This vulnerability is classified as CWE-862 (Missing Authorization), indicating that the application fails to perform authorization checks when accessing certain functionality. The flaw exists in PHPGurukul Online Course Registration through version 3.1, where critical operations can be executed without verifying whether the requesting user has the necessary permissions.

The network-based attack vector allows remote exploitation with low complexity. An authenticated attacker with low privileges can potentially access resources or perform actions intended for higher-privileged users. The vulnerability has partial impact on confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause of CVE-2025-15406 is the absence of proper authorization validation in the application's access control logic. When users make requests to certain endpoints or functions, the application fails to verify whether the authenticated user possesses the required privileges to perform the requested action. This is a fundamental broken access control flaw where the application trusts user input or session data without implementing proper permission checks.

Attack Vector

The attack can be conducted remotely over the network. An attacker with a low-privileged account can craft requests to access administrative functions or other users' data by directly invoking endpoints that lack authorization enforcement. The exploitation requires authentication but does not require user interaction, making it exploitable through automated scripts or manual HTTP requests.

For detailed technical analysis of this broken access control vulnerability, refer to the GitHub Access Control Analysis documentation.

Detection Methods for CVE-2025-15406

Indicators of Compromise

• Unusual access patterns to administrative or restricted endpoints from non-admin user sessions
• Log entries showing low-privileged users accessing functionality typically reserved for administrators
• Unexpected modification of user data or course registrations by unauthorized accounts
• HTTP requests to sensitive endpoints from sessions that lack appropriate role assignments

Detection Strategies

• Implement web application firewall (WAF) rules to monitor and alert on access attempts to administrative functions
• Review application access logs for privilege escalation patterns and unauthorized endpoint access
• Deploy runtime application self-protection (RASP) solutions to detect authorization bypass attempts
• Configure intrusion detection systems to flag anomalous user behavior patterns

Monitoring Recommendations

• Enable verbose logging for all access control decisions within the application
• Monitor authentication and session logs for attempts to access resources outside user scope
• Implement alerting for failed and successful authorization checks on sensitive functions
• Regularly audit user access patterns against expected behavior baselines

How to Mitigate CVE-2025-15406

Immediate Actions Required

• Review all application endpoints and functions for proper authorization checks
• Implement server-side authorization validation for every sensitive operation
• Restrict access to the application until proper access controls are implemented
• Audit existing user permissions and remove any unauthorized access grants

Patch Information

As of the last NVD update on 2026-01-06, no official vendor patch has been documented for this vulnerability. Organizations using PHPGurukul Online Course Registration should monitor the PHP Gurukul Security Overview page for security updates. Additional vulnerability details are available through VulDB #339326.

Workarounds

• Implement additional authorization middleware or filters at the web server or reverse proxy level
• Restrict application access to trusted networks or IP ranges until a patch is available
• Deploy a web application firewall with rules to block unauthorized access attempts
• Conduct a security review of all administrative functions and add manual authorization checks

# Example: Apache .htaccess restriction for admin directories
# Add this to restrict access to administrative functions by IP
<Directory "/var/www/html/admin">
    Order deny,allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</Directory>