CVE-2026-4584 in MPOS M6 PLUS
Summary
by MITRE • 03/23/2026
A flaw has been found in Shenzhen HCC Technology MPOS M6 PLUS 1V.31-N. This affects an unknown part of the component Cardholder Data Handler. Executing a manipulation can lead to cleartext transmission of sensitive information. The attack requires access to the local network. The attack requires a high level of complexity. It is indicated that the exploitability is difficult. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 03/23/2026
The vulnerability identified in Shenzhen HCC Technology MPOS M6 PLUS 1V.31-N represents a critical security flaw within the Cardholder Data Handler component of this mobile payment terminal device. This device operates within the financial services industry as part of point-of-sale infrastructure, handling sensitive cardholder data during transaction processing. The vulnerability manifests as a weakness in the data transmission protocols that govern how payment information flows through the system, creating an attack surface that could potentially expose confidential financial data to unauthorized parties.
The technical nature of this flaw involves cleartext transmission of sensitive information, indicating that the device fails to properly encrypt or secure data during network communication. This type of vulnerability aligns with CWE-312 (Cleartext Storage of Sensitive Information) and CWE-319 (Cleartext Transmission of Sensitive Information) categories, which specifically address the improper handling of sensitive data in transit. The attack vector requires local network access, suggesting that an adversary must be positioned within the same network segment as the target device to exploit this weakness, which limits the scope but does not eliminate the threat.
The operational impact of this vulnerability extends beyond simple data exposure, as it fundamentally compromises the security posture of payment processing systems that rely on this hardware. When sensitive cardholder data is transmitted in cleartext, it becomes immediately accessible to any network observer who can intercept the communication stream, potentially leading to full payment card fraud, identity theft, and financial loss. The high complexity requirement for exploitation, while reducing the likelihood of widespread automated attacks, does not eliminate the risk from targeted adversaries who possess the necessary technical capabilities and resources to develop sophisticated attack methods.
The difficulty of exploitability, as indicated by the assessment, suggests that while this vulnerability requires significant technical expertise to leverage effectively, it remains a serious concern given the potential rewards for attackers. The lack of vendor response to early disclosure attempts represents a critical gap in the security ecosystem, as responsible disclosure practices typically involve coordinated vulnerability handling between researchers and vendors to facilitate timely remediation. This absence of vendor engagement creates a dangerous situation where organizations continue to deploy vulnerable hardware without assurance of future security updates or patches, potentially leaving their payment processing infrastructure exposed to exploitation.
Organizations utilizing this hardware should implement immediate network segmentation measures to limit potential attack vectors and consider deploying network monitoring tools to detect anomalous traffic patterns that might indicate exploitation attempts. The vulnerability demonstrates the importance of continuous security assessment of embedded systems and the need for robust vendor security practices. From an att&ck framework perspective, this vulnerability maps to techniques involving credential access and data exfiltration, with potential for lateral movement within compromised networks. Mitigation strategies should include network-based intrusion detection systems, mandatory encryption protocols for all payment data transmission, and comprehensive vulnerability management programs that include regular security assessments of all payment processing equipment.