CVE-2025-40733
📋 TL;DR
A reflected Cross-Site Scripting (XSS) vulnerability in Daily Expense Manager v1.0 allows attackers to inject malicious JavaScript via the username parameter in login.php POST requests. This affects all users of the vulnerable version who access the login page. Attackers can steal session cookies, redirect users, or perform actions on their behalf.
💻 Affected Systems
- Daily Expense Manager
📦 What is this software?
Daily Expense Manager by Code Projects
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover, session hijacking, credential theft, and potential malware distribution to users accessing the login page.
Likely Case
Session cookie theft leading to unauthorized access to user expense data, or phishing attacks via malicious redirects.
If Mitigated
Limited impact with proper input validation and output encoding, though some user interaction may still be required.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious link) but is straightforward for attackers with basic web skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-daily-expense-manager
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available, or implement workarounds.
🔧 Temporary Workarounds
Input Validation Filter
allAdd server-side validation to sanitize username parameter before processing
Modify login.php to include: $username = htmlspecialchars($_POST['username'], ENT_QUOTES, 'UTF-8');
Content Security Policy
allImplement CSP headers to restrict script execution
Add to .htaccess: Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
Or add to PHP: 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 or restrict access to trusted users only
🔍 How to Verify
Check if Vulnerable:
Test by sending POST request to /login.php with username parameter containing <script>alert('XSS')</script> and check if script executesCheck Version:
Check application documentation or source code for version informationVerify Fix Applied:
Repeat the test with sanitized input - script should not execute and special characters should be properly encoded📡 Detection & Monitoring
Log Indicators:
- POST requests to /login.php with suspicious characters in username parameter (<, >, script, javascript)
- Multiple failed login attempts with unusual payloads
Network Indicators:
- Unusual traffic patterns to login.php with encoded payloads
- Requests containing typical XSS payload patterns
SIEM Query:
source="web_logs" AND uri_path="/login.php" AND (username="*<*" OR username="*>" OR username="*script*" OR username="*javascript*")