CVE-2026-4648
MediumCVSS 6.8Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
The cashless payment system using NFC wristbands from CasfID Servicios Tecnológicos S.L.U. (version used at Resurrection Fest 2025) employs MIFARE Classic technology (FM11RF08S) with an insecure cryptographic algorithm. The weakness allows an attacker to retrieve access keys via Backdoored Nested Attack, read the entire wristband contents, and clone credentials onto a compatible rewritable card.
Risk Assessment
An attacker can impersonate other attendees, fraudulently use the balance associated with their wristbands, leading to financial losses for both users and event organizers.
Recommendation
Immediately replace the system with a solution using a more secure cryptographic algorithm and inform users about the risk.
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Original NVD description (English source)
Use of an insecure cryptographic algorithm in the cashless payment system using NFC wristbands from CasfID Servicios Tecnológicos S.L.U. (version used at Resurrection Fest 2025), which employs cards based on MIFARE Classic technology (FM11RF08S). The cryptographic weakness of the authentication algorithm allows an attacker to retrieve access keys using techniques known as Backdoored Nested Attack, read the wristband’s entire contents, and clone its credentials onto a compatible rewritable card. Exploitation of this vulnerability could enable the impersonation of other attendees, the fraudulent use of the balance associated with their wristbands, and financial losses for both the affected users and the event organizers.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

