Huawei HarmonyOS EUVD-2026-30531

Successful exploitation requires the projection module feature to be enabled or actively listening for wireless display connections in HarmonyOS or EMUI. The attacker must have physical proximity to the target device (AV:P), typically within Bluetooth or NFC range. User interaction is required (UI:R), meaning the victim must either actively engage with a projection prompt or the attacker must socially engineer the user into approving a connection request. The vulnerability does not permit unauthenticated remote exploitation; it is strictly a local/physical attack. Exploitation is limited to scenarios where the projection module is not explicitly disabled by the user, making it less critical on devices where users have turned off wireless display functionality.

This vulnerability presents low-to-moderate real-world risk despite the moderate CVSS score of 6.2. The physical attack vector (AV:P) severely limits attack surface compared to network-exploitable flaws, restricting threats to attackers with direct device access. The requirement for user interaction (UI:R) further reduces practical exploitability, as successful attacks depend on user behavior. However, the vulnerability impacts confidentiality with high severity (C:H), meaning unauthorized projection or screen access could expose sensitive personal or business data. EPSS probability and KEV (known exploited vulnerability) status are not provided in the input, preventing comparison of real-world exploitation likelihood against the moderate CVSS rating. The absence of patch version information and the vague reference to a Huawei bulletin create uncertainty about remediation timeline and deployment priority. For devices in shared or public spaces (offices, conference rooms, classrooms), the physical proximity requirement becomes more realistic, elevating concern. Organizations should prioritize patching only after vendor releases a confirmed fix; until then, mitigations focus on user awareness and physical device control.

An attacker with physical proximity to an unattended HarmonyOS or EMUI device in a conference room initiates a wireless projection attempt. The device prompts the user (or displays a notification that the attacker manipulates) to accept the projection connection. Due to the permission control vulnerability, the attacker bypasses authorization checks and gains access to the device's display output, allowing them to view sensitive information such as confidential emails, documents, or messages being displayed on the screen. The attack succeeds because the projection module fails to enforce proper permission restrictions on who can initiate projection.