CVE-2026-4648 Insufficient Encryption Level in CasfID Servicios Tecnológicos NFC Wristbands
Weak MIFARE Classic encryption allows attackers to clone NFC wristbands, steal balances, and impersonate users in cashless payment systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4648?
CVE-2026-4648 is a medium-severity vulnerability in CasfID Servicios Tecnológicos NFC Wristbands, published on 28 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-326
Which versions are affected by CVE-2026-4648?
How do I fix CVE-2026-4648?
No fix has been published for CVE-2026-4648 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-4648 being exploited?
There is no known exploitation of CVE-2026-4648 in the wild and no public exploit code.
Sources
Also known as GHSA-4x9m-p82w-8mmp.