CVE-2025-59905
📋 TL;DR
This reflected Cross-Site Scripting (XSS) vulnerability in Kubysoft allows attackers to inject malicious scripts through multiple parameters in the '/node/kudaby/nodeFN/procedure' endpoint. When victims visit a specially crafted URL, the scripts execute in their browsers, potentially stealing session cookies, redirecting users, or performing actions on their behalf. Any Kubysoft installation with this vulnerable endpoint exposed is affected.
💻 Affected Systems
- Kubysoft
📦 What is this software?
Kubysoft by Kubysoft
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, gain full administrative access to the Kubysoft system, pivot to internal networks, or deploy ransomware through the compromised system.
Likely Case
Session hijacking of authenticated users, credential theft via fake login forms, defacement of web pages, or redirection to malicious sites.
If Mitigated
Limited to stealing non-sensitive session data from users who click malicious links, with minimal impact if proper input validation and output encoding are implemented.
🎯 Exploit Status
Reflected XSS typically requires user interaction (clicking malicious link) but is straightforward to exploit once the vulnerable parameters are identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/reflected-cross-site-scripting-xss-kubysoft
Restart Required: No
Instructions:
1. Monitor Kubysoft vendor for security updates. 2. Apply patches when available. 3. Test in development environment before production deployment.
🔧 Temporary Workarounds
Web Application Firewall (WAF) Rules
allImplement WAF rules to block XSS payloads targeting the vulnerable endpoint parameters.
# Example ModSecurity rule: SecRule ARGS "@rx <script>" "id:1001,phase:2,deny,status:403,msg:'XSS Attempt'"
# Configure WAF to sanitize input to /node/kudaby/nodeFN/procedure endpoint
Input Validation Filter
allImplement server-side input validation to sanitize or reject malicious script content in parameters.
# Example PHP sanitization: $param = htmlspecialchars($_GET['param'], ENT_QUOTES, 'UTF-8');
# Implement similar validation for all parameters in the vulnerable endpoint
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution sources.
- Disable or restrict access to the '/node/kudaby/nodeFN/procedure' endpoint if not essential.
🔍 How to Verify
Check if Vulnerable:
Test the endpoint with XSS payloads like <script>alert('XSS')</script> in parameters and check if script executes in response.Check Version:
Check Kubysoft documentation or admin interface for version information; specific command varies by installation.Verify Fix Applied:
Retest with XSS payloads after applying fixes; scripts should be properly encoded or blocked without execution.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /node/kudaby/nodeFN/procedure with script tags or JavaScript in parameters
- Unusual parameter values containing <script>, javascript:, or encoded payloads
Network Indicators:
- HTTP traffic with XSS payloads in GET/POST parameters to the vulnerable endpoint
- Abnormal redirects or script loads following requests to the endpoint
SIEM Query:
source="web_logs" AND uri="/node/kudaby/nodeFN/procedure" AND (param="*<script>*" OR param="*javascript:*")