CVE-2026-4648Public exploit

Credential cloning via backdoored card authentication

Published Jul 28, 2026 · Updated Jul 28, 2026

Inadequate encryption in CASFID NFC Wristbands using the FM11RF08S variant allows physically proximate attackers to recover keys and clone cards. The FM11RF08S authentication design contains a hardware backdoor whose cracked key lets the Backdoored Nested Attack recover every user-defined card key. A few minutes of physical card access is required; recovered keys expose the complete wristband contents and permit credential cloning, attendee impersonation, and fraudulent balance use.

CVSS severity6.8
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Inadequate encryption in CASFID NFC Wristbands using the FM11RF08S variant allows physically proximate attackers to recover keys and clone cards. The FM11RF08S authentication design contains a hardware backdoor whose cracked key lets the Backdoored Nested Attack recover every user-defined card key. A few minutes of physical card access is required; recovered keys expose the complete wristband contents and permit credential cloning, attendee impersonation, and fraudulent balance use.

The record

CVE
CVE-2026-4648
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
CASFID
Product
NFC Wristbands
Classifications
CWE-326
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=FM11RF08S variant

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

CASFID · NFC Wristbandsversion=FM11RF08S variant

Published CVSS scores

6.8INCIBECVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-326Inadequate Encryption Strength

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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