CVE-2025-30073
📋 TL;DR
This vulnerability in OPC cardsystems Webapp Aufwertung 2.1.0 allows transaction reference reuse, enabling attackers to load more money onto employee cards than actually paid. The flaw affects organizations using this specific web application for card value management. Attackers can exploit timing conditions to complete multiple transactions with the same reference.
💻 Affected Systems
- OPC cardsystems Webapp Aufwertung
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Financial loss through unauthorized card value increases, potentially draining organizational funds if exploited systematically.
Likely Case
Limited financial fraud where attackers exploit the flaw to add value to specific cards without full payment.
If Mitigated
Minimal impact with proper transaction auditing and monitoring controls in place.
🎯 Exploit Status
Exploitation requires understanding of transaction timing and access to payment interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 2.1.0
Vendor Advisory: https://www.syss.de/pentest-blog/businesslogik-fehler-bei-aufwertung-von-geldkarten-in-opcr-webapp-aufwertung-syss-2024-089
Restart Required: No
Instructions:
1. Contact OPC cardsystems for updated version. 2. Apply patch or upgrade to latest version. 3. Test transaction functionality after update.
🔧 Temporary Workarounds
Transaction Reference Validation
allImplement server-side validation to ensure transaction references are unique and cannot be reused.
🧯 If You Can't Patch
- Implement strict transaction monitoring and alerting for duplicate references
- Add manual approval process for card value increases above certain thresholds
🔍 How to Verify
Check if Vulnerable:
Test if transaction references can be reused by attempting duplicate transactions with same reference.Check Version:
Check application version in admin interface or configuration files.Verify Fix Applied:
Verify that duplicate transaction references are rejected and generate unique reference IDs for each transaction.📡 Detection & Monitoring
Log Indicators:
- Multiple transactions with identical reference IDs
- Card value increases without corresponding payments
Network Indicators:
- Repeated transaction requests with same parameters
SIEM Query:
source="webapp_logs" AND (transaction_reference_count > 1 OR card_value_increase > payment_amount)