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.
Metrics
Affected Vendors & Products
References
History
Tue, 28 Jul 2026 21:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Casfid Servicios Tecnológicos
Casfid Servicios Tecnológicos nfc Wristbands |
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| Vendors & Products |
Casfid Servicios Tecnológicos
Casfid Servicios Tecnológicos nfc Wristbands |
Tue, 28 Jul 2026 16:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | Insufficient Encryption Level in CasfID Servicios Tecnológicos NFC Wristbands | |
| Weaknesses | CWE-326 | |
| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: INCIBE
Published: 2026-07-28T11:41:15.571Z
Updated: 2026-07-28T12:04:41.531Z
Reserved: 2026-03-23T12:50:31.162Z
Link: CVE-2026-4648
Updated: 2026-07-28T12:04:38.516Z
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