CVE-2025-41346
📋 TL;DR
CVE-2025-41346 is an authorization bypass vulnerability in WinPlus v24.11.27 that allows attackers to impersonate any user by knowing their numerical ID. This affects all users of the vulnerable software version, enabling complete account takeover and compromising all data within the application.
💻 Affected Systems
- WinPlus by Informática del Este
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of all user accounts and data, including administrative access, leading to data theft, destruction, or ransomware deployment.
Likely Case
Targeted account takeover of specific users to steal sensitive data, modify records, or disrupt business operations.
If Mitigated
Limited impact with proper network segmentation and monitoring, though authentication bypass remains possible.
🎯 Exploit Status
The vulnerability requires only knowledge of a user's numerical ID, which may be predictable or discoverable. No authentication is needed to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/stored-cross-site-scripting-xss-winplus-informatica-del-este
Restart Required: No
Instructions:
Check the vendor advisory for updates. If a patch is released, apply it immediately following vendor instructions.
🔧 Temporary Workarounds
Network Isolation
allRestrict network access to the WinPlus application to only trusted users and systems.
Use firewall rules to limit inbound connections to specific IP ranges.
User ID Obfuscation
windowsImplement additional authentication checks or use non-predictable user identifiers.
Modify application configuration if possible to require additional authentication factors.
🧯 If You Can't Patch
- Monitor authentication logs for unusual account access patterns or multiple failed login attempts.
- Implement strict network segmentation to isolate the vulnerable system from critical infrastructure.
🔍 How to Verify
Check if Vulnerable:
Check the application version in the software interface or configuration files. If it is v24.11.27, it is vulnerable.Check Version:
Check the application's 'About' section or configuration files for version information.Verify Fix Applied:
After applying any vendor patch, test authorization controls by attempting to access another user's account with only their numerical ID.📡 Detection & Monitoring
Log Indicators:
- Unusual login patterns, access from unexpected IP addresses, multiple account access from single session.
Network Indicators:
- Unusual HTTP requests containing numerical IDs in parameters, especially to authentication endpoints.
SIEM Query:
source="winplus_logs" AND (event="authentication" AND user_id_changed OR multiple_account_access)