CVE-2025-48373
📋 TL;DR
This vulnerability allows attackers to bypass authentication in the Schule school management system by manipulating client-side JavaScript role validation. Attackers can change their role to 'admin' or other privileged values using browser dev tools or API interception, gaining unauthorized access to restricted panels. All users of Schule versions before 1.0.1 are affected.
💻 Affected Systems
- Schule School Management System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise where attackers gain administrative access, potentially accessing sensitive student data, modifying grades, altering system configurations, or performing unauthorized administrative actions.
Likely Case
Unauthorized access to administrative functions, viewing of sensitive student and staff information, and potential data manipulation in restricted areas of the application.
If Mitigated
Limited impact with proper server-side validation, where role-based access controls are enforced regardless of client-side manipulation attempts.
🎯 Exploit Status
Exploitation requires authenticated access but then simple JavaScript manipulation via browser dev tools. The advisory includes technical details making exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.1
Vendor Advisory: https://github.com/schule111/Schule/security/advisories/GHSA-37h9-qq7c-6mc9
Restart Required: Yes
Instructions:
1. Backup current installation and data. 2. Download version 1.0.1 from the official repository. 3. Replace the vulnerable index.js file with the patched version. 4. Restart the application server. 5. Verify role validation now occurs server-side.
🔧 Temporary Workarounds
Implement Server-Side Role Validation
allAdd server-side checks to validate user roles before granting access to restricted panels, regardless of client-side JavaScript values.
Modify server-side authentication middleware to validate user roles from session/token rather than client data
Disable Client-Side Role Routing
allTemporarily disable the vulnerable JavaScript routing and implement server-side redirects based on authenticated user roles.
Comment out or remove the vulnerable role-based routing logic in index.js and implement server-side redirects
🧯 If You Can't Patch
- Implement a Web Application Firewall (WAF) with rules to detect and block role manipulation attempts
- Enable detailed logging of all authentication and authorization events for monitoring and alerting on suspicious role changes
🔍 How to Verify
Check if Vulnerable:
Inspect the index.js file for client-side role validation without server-side verification. If role-based redirects rely solely on client-side JavaScript data.role values, the system is vulnerable.Check Version:
Check the application version in the admin panel or review the package.json/version file in the installation directory.Verify Fix Applied:
After patching, attempt to manipulate data.role via browser dev tools and verify that server-side validation prevents unauthorized access to restricted panels.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful access to admin panels
- User accessing panels inconsistent with their assigned role
- JavaScript errors related to role validation
Network Indicators:
- Unusual API calls to restricted endpoints from non-admin users
- Modified HTTP requests containing manipulated role parameters
SIEM Query:
source="application_logs" AND (event="unauthorized_access" OR event="role_violation" OR message="*admin*access*" OR message="*role*manipulation*")