CVE-2025-63640
📋 TL;DR
CVE-2025-63640 is a stored cross-site scripting (XSS) vulnerability in Sourcecodester Medicine Reminder App v1.0 that allows attackers to inject malicious JavaScript into medicine reminder entries. When victims view or interact with compromised reminders, the attacker's code executes in their browser session. This affects all users of the vulnerable application version.
💻 Affected Systems
- Sourcecodester Medicine Reminder App
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform account takeover, redirect users to malicious sites, or deploy ransomware-like browser attacks against authenticated users.
Likely Case
Attackers would typically steal session tokens to hijack user accounts, potentially accessing personal health information or modifying medication reminders.
If Mitigated
With proper input validation and output encoding, the malicious payloads would be rendered harmless as plain text rather than executable code.
🎯 Exploit Status
Exploitation requires the attacker to have an account or trick an authenticated user into creating malicious reminders. The vulnerability is simple to exploit once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Download the latest version from Sourcecodester if available. 2. Replace vulnerable files with patched versions. 3. Test the application functionality.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement server-side validation and HTML encoding for all user inputs in the Medicine Reminder App
Implement input validation in JavaScript: function sanitizeInput(input) { return input.replace(/[<>"']/g, ''); }
Content Security Policy (CSP)
allImplement a strict Content Security Policy header to prevent execution of inline JavaScript
Add HTTP header: Content-Security-Policy: default-src 'self'; script-src 'self'
🧯 If You Can't Patch
- Implement a web application firewall (WAF) with XSS protection rules
- Disable the application until a secure version is available
🔍 How to Verify
Check if Vulnerable:
Test by entering <script>alert('XSS')</script> in Medicine Name or Notes fields when creating a reminder and check if alert executesCheck Version:
Check the application's version in the source code or documentation filesVerify Fix Applied:
Attempt the same XSS payload and verify it's displayed as plain text rather than executing📡 Detection & Monitoring
Log Indicators:
- Unusual long input strings in medicine reminder creation logs
- HTML/JavaScript patterns in user input fields
Network Indicators:
- HTTP requests containing script tags or JavaScript in POST data to reminder creation endpoints
SIEM Query:
source="web_logs" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=") AND uri_path="/reminder/create"