The vulnerability identified as CVE-2026-2539 concerns the Micca Auto Electronics Co., Ltd. KE700 car alarm system. The core issue lies in the RF communication protocol used by the device, which transmits critical authentication data—specifically random numbers and counters—in cleartext without encryption. These data elements are essential for the authentication process between the car alarm system and its remote controls or sensors. An attacker equipped with a radio interception tool, such as a software-defined radio (SDR), can passively capture these transmissions from a distance. Since the data is unencrypted, the attacker can analyze and potentially reuse this information to bypass the alarm system's security mechanisms, for example, by replaying captured signals or crafting malicious transmissions that the system accepts as legitimate. The vulnerability has a CVSS 4.0 base score of 5.7, reflecting a medium severity level. The vector indicates that the attack requires adjacent network access (radio proximity), has low attack complexity, no privileges or user interaction, but impacts confidentiality and has a high scope impact due to the potential compromise of authentication data. No patches or firmware updates have been published yet, and no exploits are known in the wild. The vulnerability falls under CWE-319, which covers cleartext transmission of sensitive information, a common security weakness that can lead to interception and misuse of data.

For European organizations, especially those managing vehicle fleets or relying on the Micca KE700 car alarm system for physical security, this vulnerability poses a risk of unauthorized access to vehicles. Attackers could intercept authentication data to disable alarms, unlock vehicles, or otherwise circumvent security controls, leading to theft or unauthorized use. The impact extends to potential loss of assets, increased insurance costs, and reputational damage. The vulnerability also undermines trust in the security of automotive aftermarket devices, which are widely used across Europe. Given the medium severity, the risk is significant but requires attacker proximity and specialized equipment. However, the ease of obtaining SDR tools and technical knowledge means motivated attackers could exploit this vulnerability in urban or accessible environments. Organizations in sectors such as logistics, transportation, and car rental services are particularly at risk due to their reliance on vehicle security systems.

Since no patches are currently available, organizations should take immediate steps to reduce exposure. First, restrict physical and RF access to vehicles equipped with the KE700 system by parking in secure, shielded areas or garages that limit radio signal interception. Employ RF shielding solutions or Faraday cages where feasible. Monitor for suspicious RF activity around vehicles using RF detection tools. Engage with Micca Auto Electronics to request firmware updates that implement encryption and secure authentication protocols. Consider replacing vulnerable KE700 systems with alternative products that use encrypted communication. Train security personnel to recognize potential RF-based attacks and incorporate this threat into risk assessments. Additionally, implement layered security controls such as GPS tracking and immobilizers to mitigate the impact of alarm system compromise.