CVE-2026-4582 Overview
A security vulnerability has been identified in Shenzhen HCC Technology MPOS M6 PLUS firmware version 1V.31-N. The vulnerability affects the Bluetooth component of the mobile point-of-sale (MPOS) device, allowing unauthorized access due to missing authentication. This authentication bypass vulnerability (CWE-287) could enable an attacker within adjacent network proximity to interact with the device without proper credential verification.
Critical Impact
Attackers within Bluetooth range can potentially bypass authentication mechanisms on the MPOS M6 PLUS payment terminal, potentially enabling unauthorized device access and manipulation of payment processing functions.
Affected Products
- Shenzhen HCC Technology MPOS M6 PLUS 1V.31-N
Discovery Timeline
- 2026-03-23 - CVE-2026-4582 published to NVD
- 2026-03-23 - Last updated in NVD database
Technical Details for CVE-2026-4582
Vulnerability Analysis
This vulnerability represents a Missing Authentication weakness (CWE-287) in the Bluetooth component of the Shenzhen HCC Technology MPOS M6 PLUS payment terminal. The vulnerability allows an attacker positioned within Bluetooth range to interact with the device without proper authentication validation. While the attack requires adjacent network access (physical proximity via Bluetooth) and the exploitation is considered highly complex, successful attacks could compromise the confidentiality, integrity, and availability of the payment device.
The vendor was contacted regarding responsible disclosure but did not respond. Technical documentation regarding the authentication bypass is available through the GitHub CVE-1 Exploit Documentation.
Root Cause
The root cause of this vulnerability lies in the improper implementation of authentication controls within the Bluetooth component of the MPOS M6 PLUS device. The affected functionality fails to properly verify the identity of connecting devices or users before granting access to sensitive operations. This missing authentication check allows unauthorized entities to establish connections and potentially interact with payment processing functions.
Attack Vector
The attack vector requires the adversary to be within Bluetooth range of the vulnerable MPOS device, classified as an Adjacent Network attack. The attacker must be in physical proximity to establish a Bluetooth connection with the target device. While no network-based remote exploitation is possible, the nature of MPOS devices being used in retail environments means they may be exposed to potential attackers in public spaces. The exploitation is noted as highly complex, requiring specific technical knowledge of the Bluetooth protocol implementation and the device's authentication mechanisms.
The vulnerability manifests in the Bluetooth pairing and connection handling functionality. Detailed technical information about the authentication bypass mechanism can be found in the GitHub exploit documentation. Additional context is available through the VulDB CTI Report #352419.
Detection Methods for CVE-2026-4582
Indicators of Compromise
- Unusual Bluetooth connection attempts or successful connections from unknown device addresses to the MPOS terminal
- Unexpected Bluetooth pairing events occurring without operator initiation
- Anomalous communication patterns on the Bluetooth interface of the MPOS device
- Unauthorized transaction attempts or device configuration changes
Detection Strategies
- Monitor Bluetooth connection logs on MPOS devices for connections from unrecognized or suspicious device MAC addresses
- Implement Bluetooth device whitelisting and alert on connection attempts from non-whitelisted devices
- Deploy endpoint detection solutions capable of monitoring Bluetooth activity on payment terminals
- Review audit logs for unauthorized device access or configuration changes
Monitoring Recommendations
- Establish baseline Bluetooth activity patterns for MPOS devices and alert on deviations
- Implement physical security monitoring in areas where MPOS devices are deployed
- Configure centralized logging for all MPOS device connection events and review regularly
- Consider network segmentation to isolate payment terminals and enable focused monitoring
How to Mitigate CVE-2026-4582
Immediate Actions Required
- Disable Bluetooth functionality on affected MPOS M6 PLUS devices if not required for business operations
- Restrict physical access to areas where vulnerable MPOS devices are deployed
- Implement Bluetooth device whitelisting where supported by the device firmware
- Monitor for unusual connection attempts or unauthorized device interactions
Patch Information
At the time of publication, no vendor patch is available. The vendor (Shenzhen HCC Technology) was contacted regarding responsible disclosure but did not respond. Organizations using affected devices should contact the vendor directly for firmware update information and monitor the VulDB entry #352419 for updates.
Workarounds
- Disable Bluetooth on the MPOS device entirely if the functionality is not business-critical
- Implement physical security controls to limit attacker proximity to the device
- Use Bluetooth shielding or restricted transmission power settings if available
- Consider replacing affected devices with models from vendors with active security response programs
- Implement additional transaction verification controls as a compensating measure
# Configuration example - Bluetooth disable recommendation
# Note: Specific commands depend on device firmware interface
# Consult vendor documentation for device-specific procedures
# General recommendation: Access device settings menu
# Navigate to: Settings > Connectivity > Bluetooth
# Set Bluetooth status to: Disabled
# If command-line access is available:
# bluetooth_control --disable
# bluetooth_control --status # Verify disabled state
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
