CVE-2026-4648

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.

CVSS

No CVSS.

References

Link	Resource
https://www.incibe.es/en/incibe-cert/notices/aviso/insufficient-encryption-level-casfid-servicios-tecnologicos-nfc

Configurations

No configuration.

History

24 Oct 2026, 13:10

Type	Values Removed	Values Added
Summary		(es) Uso de un algoritmo criptográfico inseguro en el sistema de pago sin efectivo que utiliza pulseras NFC de CasfID Servicios Tecnológicos S.L.U. (versión utilizada en Resurrection Fest 2025), que emplea tarjetas basadas en tecnología MIFARE Classic (FM11RF08S). La debilidad criptográfica del algoritmo de autenticación permite a un atacante recuperar las claves de acceso utilizando técnicas conocidas como Backdoored Nested Attack, leer el contenido completo de la pulsera y clonar sus credenciales en una tarjeta regrabable compatible. La explotación de esta vulnerabilidad podría permitir la suplantación de otros asistentes, el uso fraudulento del saldo asociado a sus pulseras y pérdidas económicas tanto para los usuarios afectados como para los organizadores del evento.

Information

Published : 2026-07-28 12:16

Updated : 2026-10-24 13:10

NVD link : CVE-2026-4648

Mitre link : CVE-2026-4648

CVE.ORG link : CVE-2026-4648

JSON object : View

Products Affected

No product.

CWE

CWE-326

Inadequate Encryption Strength

{"id": "CVE-2026-4648", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-4648", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-07-28T12:04:32.686293Z"}}], "cvssMetricV40": [{"type": "Secondary", "source": "cve-coordination@incibe.es", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.8, "Automatable": "NOT_DEFINED", "attackVector": "PHYSICAL", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "cve-coordination@incibe.es", "affectedData": [{"vendor": "CasfID Servicios Tecnol\u00f3gicos", "product": "NFC Wristbands", "versions": [{"status": "affected", "version": "FM11RF08S variant", "versionType": "custom"}], "defaultStatus": "unaffected"}]}], "published": "2026-07-28T12:16:36.467", "references": [{"url": "https://www.incibe.es/en/incibe-cert/notices/aviso/insufficient-encryption-level-casfid-servicios-tecnologicos-nfc", "source": "cve-coordination@incibe.es"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "cve-coordination@incibe.es", "description": [{"lang": "en", "value": "CWE-326"}]}], "descriptions": [{"lang": "en", "value": "Use of an insecure cryptographic algorithm in the cashless payment system using NFC wristbands from CasfID Servicios Tecnol\u00f3gicos 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\u2019s 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."}, {"lang": "es", "value": "Uso de un algoritmo criptogr\u00e1fico inseguro en el sistema de pago sin efectivo que utiliza pulseras NFC de CasfID Servicios Tecnol\u00f3gicos S.L.U. (versi\u00f3n utilizada en Resurrection Fest 2025), que emplea tarjetas basadas en tecnolog\u00eda MIFARE Classic (FM11RF08S). La debilidad criptogr\u00e1fica del algoritmo de autenticaci\u00f3n permite a un atacante recuperar las claves de acceso utilizando t\u00e9cnicas conocidas como Backdoored Nested Attack, leer el contenido completo de la pulsera y clonar sus credenciales en una tarjeta regrabable compatible. La explotaci\u00f3n de esta vulnerabilidad podr\u00eda permitir la suplantaci\u00f3n de otros asistentes, el uso fraudulento del saldo asociado a sus pulseras y p\u00e9rdidas econ\u00f3micas tanto para los usuarios afectados como para los organizadores del evento."}], "lastModified": "2026-10-24T13:10:00.147", "sourceIdentifier": "cve-coordination@incibe.es"}