CVE-2026-20470 in MT6739
Summary
by MITRE • 08/03/2026
In Telephony, there is a possible information disclosure due to a missing permission check. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS11086431; Issue ID: MSV-8189.
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Analysis
by VulDB Data Team • 08/03/2026
This vulnerability resides within telephony subsystems where inadequate permission validation creates a pathway for unauthorized information exposure. The flaw manifests as a missing access control check that allows local processes to bypass normal security boundaries and access sensitive telephony data. Without requiring any additional privileges or user interaction, malicious actors can exploit this weakness to extract confidential information from the telephony service components. The vulnerability represents a critical security gap in the privilege escalation model where proper authorization mechanisms fail to validate access requests before granting data retrieval capabilities.
The technical implementation of this flaw demonstrates a failure in the security architecture that governs telephony service operations. When telephony processes attempt to access internal data structures or communication channels, the system should enforce strict permission checks to ensure only authorized components can retrieve sensitive information. However, due to the missing validation mechanism, any local process can potentially traverse these security boundaries and obtain data that should remain restricted. This represents a fundamental breakdown in the principle of least privilege enforcement that is critical for maintaining system integrity.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass potential compromise of telephony communications and user privacy. Local attackers can exploit this weakness to access call logs, contact information, communication metadata, and other sensitive telephony data without requiring elevated privileges or user interaction. The absence of user interaction requirements makes this vulnerability particularly dangerous as it can be exploited automatically by malicious processes running with standard user permissions. This could enable adversaries to gather intelligence about communication patterns, identify key contacts, and potentially establish persistence within the device.
From a cybersecurity perspective, this vulnerability aligns with common weakness enumerations such as CWE-284 which addresses improper access control issues in software systems. The flaw also maps to attack techniques described in the mitre att&ck framework under privilege escalation and credential access categories where adversaries seek to obtain unauthorized access to system resources without requiring additional privileges. The patch identifier ALPS11086431 suggests this was addressed through firmware or system software updates that implemented proper permission validation mechanisms for telephony service components.
Effective mitigation strategies should focus on implementing comprehensive access control checks throughout the telephony subsystem where all data access requests are validated against appropriate permission levels before processing. Organizations should ensure that system updates are applied promptly to address this vulnerability and that proper monitoring is established to detect unauthorized access attempts to telephony services. Additionally, regular security assessments of telephony components should verify that proper authorization mechanisms are in place and functioning correctly. The remediation approach should include reviewing all telephony service interfaces to ensure they properly enforce access controls and prevent unauthorized data disclosure through similar permission validation gaps.